Car Rentals 101: Save Money on Your Rentals

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Unlike hotel and airfare rates, car rental prices vary wildly across different websites. The best rental rates are often less than half of what you can find on a site like Expedia or Travelocity. Unfortunately, there isn’t a car rental booking site that is right for every person, and every rental—although Autoslash comes close.

Autoslash is the easiest way to get a great rate on your car rental reservation. But it doesn't always find the absolutely lowest rate. If you are willing to spend extra time and effort, you can sometimes find even lower rates.



Using Autoslash

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Most online travel sites only search the regular rates, not the many special discounted rates that are widely available for car rentals. But Autoslash works differently.

  • Autoslash searches a wide variety of discount and coupon codes, across a number of sites, to try to find the lowest rate. These discounted rates are typically considerably cheaper than the rates that show up on other online travel or car rental websites. When you initiate your search, you can select all the discount programs that you are entitled to access from Autoslash's list.
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  • Using Autoslash is a bit "weird". Unlike most other websites, Autoslash doesn't show you your rates right away. Instead, you fill out your rental information and they will send you an email a few minutes later. You then need to click on a link in the email to visit a webpage that shows the actual rates from several different rental car companies.
  • If you want to make a reservation, you can book via Priceline. This may be confusing, because while you make your reservation with Priceline, the rates are the ones that Autoslash found, not the normal rates you would find if you went directly to the Priceline website. Rest assured that Autoslash isn't just a front-end to Priceline. They simply have a deal that lets them leverage Priceline's backend to handle the actual reservation with the rate code that Autoslash uncovered. Also, while it says "Pay at Counter" that usually translates to paying when you drop off your car, like a normal car rental reservation.

    In many cases, you'll also have the option of booking an even cheaper rate directly through Autoslash. For these "Pay Now" rates, you'll need to pay in full when you make the reservation, but you can cancel or change the reservation up to 48 hours before pick-up. This is much better than a typical non-refundable rate. However, with "Pay Now" reservations, you won't be able to add your frequent renter number to the reservation ahead of time. You can still add it at the counter when you arrive or with National at the exit gate after you choose your car from the Emerald Aisle. But this is less convenient than with a regular reservation.

  • Autoslash often automatically includes a coupon code in your reservation. That typically means that you won’t be able to add an additional coupon after you book.
  • You can't always count on Autoslash finding the absolutely cheapest rate, even for sites that it purports to search. For example, even though Autoslash is supposed to search the Costco rates, we sometimes find cheaper rates when searching directly through the Costco website. If you are going to search only one site, make it Autoslash. But, if you are willing to spend more time and effort, it can be worthwhile searching additional sites.
  • Regardless of how you book, Autoslash will keep trying to get you a lower rate. If it finds one, you'll get a notification to re-book your reservation. Even if you wind up making your initial reservation elsewhere, you can enter confirmation number into Autoslash to have them notify you of a lower rate.

Don't ignore smaller rental car companies

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Many people avoid smaller car rental companies, but we will rent from them, when their prices are significantly lower than what you can get at the larger companies.

In most cases, their airport locations are just as conveniently located. While their cars are often (but not always) a bit older and more worn-down, they usually still provide reliable transportation.

  • The cheapest rates are almost always at smaller car rental companies. You usually won’t find the best rates from Avis, Hertz, and National, or even from their somewhat smaller brethren, like Alamo or Budget. Instead, the very best rates are likely to be from much smaller companies like E-Z Car Rentals or Ace Rent a Car. For example:
    • A Christmas week rental in Orlando from Avis or Hertz was around $400. You could get the price down to around $300, by taking advantage of various discounted rates. But a mid-size rental with Economy Rent-a-car, for the same week, was only $132. 
    • A weekend rental on a less busy weekend in San Diego might cost around $145 with the big-name companies or about $100 with a good discounted rate. However, you could rent a car with several smaller companies for only about $55.
    • A one-day rental on a busy weekday in Dallas might cost $80, or $70 with a discounted rate. However, you could rent a car from smaller companies for about $50.  
  • If you want to find rates for smaller car rental companies, you are going to have to search on an online travel site like Expedia or Kayak.com. Many of the more specialized car rental sites (described above) don’t search the little guys.
  • It doesn’t make much difference which one you use. We compared a handful of sites like Expedia, Travelocity, carrentals.com, and rentalcars.com, and in almost all cases, they returned essentially the same prices. Perhaps that comes as no surprise, as Expedia owns many of them.

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  • On average, you can expect more hassles at pickup. Some locations try to make up for their low rates with aggressive sales pushes. In addition, you may need to spend more time inspecting the car for damage and there are no "choose your car" programs to take advantage of. One more warning. AutoSlash, one of our favorite car rental resources, specifically recommends avoiding Payless.
  • The biggest downside of smaller companies is that they don’t have many off-airport locations. This makes it harder to take advantage of tactics that avoid airport taxes or deal with a car that is having unexpected problems.

Searching additional sites

While Autoslash is the single best tool for car rentals, it can be worthwhile to check other some other sites as well.

  • If you have access to a good corporate or organizational discount code, it can often provide the best rates with certain rental car companies. For example, one of us used to work at Microsoft and their rates with Avis and National were often fantastic, especially for domestic rentals. However, their corporate rate with Hertz was often higher than the prices we could find elsewhere. Many discount codes available to employees of smaller companies are not as good. If your organization allows you to use their car rental rates with your personal rentals, it is worthwhile to check them—either through your organization’s travel portal or by entering an applicable rate code into each rental company’s website. Use Corporate Car Rental Discounts (If You Can).
  • On average, Costco's rates are better than most other discount programs and its site is easy to use. If you are a Costco member, their website is often the best place to go for a US or Canadian reservation (other than Autoslash). Their rates are generally better than what you can get with AAA, AARP, or other widely available discounts codes. And they let you easily search Alamo, Avis, Budget, and Enterprise using a single search.
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    Sometimes their rates can be ridiculously low. For example, for a recent weekend rental in San Diego, the normal rate was around $145. Discounted rates were around $100. But Costco’s rate for an Avis rental was only $35.

  • The other widely available options for discounted rates are about the same. We found the discount rates available from Groupon tend to be a bit better than those from the Entertainment Book, AARP, BJs, AAA, or the car rental company’s loyalty program. However, on any given reservation, any given code can bring up the lowest rates. If you are willing to spend the time, it can be worthwhile checking multiple codes.
  • Unfortunately, checking these rates can be time consuming.  You can check BJs and AAA rates on their websites. But for Groupon, AARP, the Entertainment Card, and each rentals company’s member rates, you need to individually check each car rental company and code combination. 

    Our approach is to use a quick search on an online travel site (like Expedia) to narrow down the list of companies we check to only those with the lowest “regular” prices. For example, if a search on Expedia shows the lowest rates on Alamo and Hertz, focus your time there, rather than with Avis, National, etc. Then try your search using a couple of different codes to see which one has the lowest rates.

    Groupon Entertainment Card AARP
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    entbk16
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    A433300 B790000 A359810
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    B006300 X443000 Y508537
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    101348
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    etatlt10 enbkwr6
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    1982822 205521
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    5031082
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    A067700 A057400
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    101349

Other tips to save money on your car rentals

  • Always use a coupon for your rental (on top of whatever discounted rate you are getting). Even when you are renting a car with a discount code, such as from AAA or Costco, you can still apply a car rental coupon to save even more. Valid coupon codes are almost always available, trivial to find, and sometimes deliver substantial additional savings, like a free day on a weekend rental or $25 off a weekly rental. At a minimum, you should be able to get a free upgrade to the next sized car. Without much effort, you should be able use a coupon on every rental. For more details on finding and using coupons, view:
  • Consider prepaying to get a 5-30% discount. Being able to cancel or change your reservation, at any time, without any fees, is one of the best things about typical car rentals. While this freedom is great for renters, it makes it hard for the car rental companies to do business. As a result, most rental companies have started offering additional discounts to people who are willing to prepay for their rental and agree to a non-refundable rate. Just remember, if you take advantage of these rates and need to make any changes, you'll pay a penalty or forfeit the entire amount of money you've spent; and you won't be able to take advantage of a better deal or promotion you find afterwards.
  • If you are almost certain that you are going on your trip, it is often worth the risk. One strategy we often follow is to lock in a good regular (refundable) car rental rate, and then a few days before the trip, switch over to a lower non-refundable rate (if it is still available).

  • For domestic rentals, consider booking an economy car. Because demand for economy and compact cars is so low, US-based rental locations typically don’t keep many of these cars in stock, and you’ll frequently get a free upgrade to a larger car—while still paying the lowest possible price. If you prefer a larger car and aren’t automatically upgraded, you can typically pay a small extra charge at pick-up, to get the card you want. However, if you really must have a larger car, reserve it ahead-of-time, and don't take any chances.
  • Another caveat is that the best coupons are often not valid on rental classes below an intermediate car. You may pay less overall to book an intermediate car with a coupon, than an economy car without one.

    Automatic upgrades from economy to larger-sized cars don't work in much of the rest of the world. Outside of the United States, many people prefer smaller cars. You should follow their lead, if you can, as rates for larger cars are often much higher.

  • Use a credit card that offers bonus rewards for travel purchases. The best credit cards for travel rewards, such as the Chase Sapphire Reserve card (which also provides primary rental car coverage), earn rewards with a value of around 5.1 cents per dollar on car rentals. That’s like getting another 5.1% off your rental price. Best Credit Cards for Travel Spending.
  • (advanced) Consider renting an off-airport location instead. Primarily due to the high taxes and fees imposed at airport rental locations, you can often save a considerable amount of money by renting at an off-airport location instead. The cost of a quick taxi or car service ride to the rental location can often be a small fraction of the amount you'd save. Alternatively, you can rent a car at the airport for the first day and then swap it out at an off-airport location for the rest of your rental period. Eliminate Expensive Taxes and Fees by Renting or Swapping Your Car at Non-Airport Locations.
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Dealing with Sky High Prices
  • Rates from corporate codes often stay low, even when regular rates go sky high. Businesses put a high priority on the predictability of rates from their car rental partners. As a result, many corporate contracts have relatively “flat” pricing (the negotiated rates don’t fluctuate as much as regular rates). When demand is high and the “regular” prices rise significantly, the price for the corporate rental can remain low.
  • For example, we recently looked at a Christmas rental in Orlando where National’s public prices were over $600, but the rate with Microsoft’s corporate code was only $266; and a weekly rental in Maui where all the big car rental companies were almost $1,000, and the rate with the Microsoft code was only $237.

    When rates are very high, always try any corporate codes you have access to. You might not save as much as the examples above, but you are likely to save more money than you can from the more generally available discount programs.

  • Rates from Citibank’s travel portal can stay relatively low as well. If you have a ThankYou Rewards credit card, you can use the Citibank Travel Portal to book cash-based reservations, not just reservations that use your points. The rates on this portal are simply weird. Most of the time that we’ve checked, rates are higher than the rates available from other discounts, and sometimes higher than even the non-discounted rates. However, when prices are particularly high, the rates (particularly with National Rental Car) can be significantly lower than other websites. For the Maui reservation above, the best non-corporate rate we could find was $820 at Costco. However, Citibank had rates available for only $400. Chase's travel portal used to work similarly. But it is now powered by Expedia, and no longer offers unusual rates.

Avoid paying for any optional fees

Once you’ve booked a good rate, you need to avoid paying any unnecessary fees.

  • (In most cases) turn down the insurance options. If you have auto insurance, are using a credit card, and are renting in the United States, Canada, or Europe, you are almost certainly covered by your existing insurance. Ignore the sales pitch and turn down all the extra insurance options. However, if you don’t have regular auto insurance or you are travelling outside of these areas, you might need to get liability coverage from the car rental company. Guide to Car Rental Insurance.
  • Turn down the prepaid tank of gas. Car rental companies typically offer to let you prepay for gas at competitive prices, so that you don’t have to swing by a gas station before you return your car. This is almost always a bad deal. They charge you for the entire tank, regardless of how much gas you have when you return the car. If you come back with a half tank, you're effectively paying double the per-gallon-rate. The only way a prepaid tank is affordable, is if you bring the car back nearly empty—but that's stressful and not always possible. On a short rental, consider having the rental car company fill the car up for you and just pay the high per-gallon cost. On a longer rental, fill it up yourself.
  • Use your phone instead of a GPS. The days of needing to rent a GPS navigation system while travelling in strange city are gone. Take advantage of the mapping software that runs on your phone. Just make sure to travel with a way to plug your phone in, to keep the batteries going. We also recommend travelling with a cell phone mount.
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  • Try to avoid using the rental car tolling transponder to pay electronic tolls.  If you are renting in an area with electronic tolling, your car will come with a tolling device and your rental company will charge you for any electronic tolls. However, they will also add an additional fee of typically $3-4 for every day of your rental (not just the days you pay tolls), while at the same time charging you the non-discounted toll rate. This is a plain-and-simple rip off. If you can, avoid toll roads and tolled lanes and you’ll avoid these ridiculous “convenience” fees. However, sometimes it is impossible or inconvenient to avoid electronic tolling. In that case, you still have some options to avoid the extra fees. Avoid Paying Outrageous Car Rental Toll Surcharges.
  • You can often avoid paying an additional driver fee. Most car rental companies will allow you to add your spouse or domestic partner as an additional driver, at no additional charge, at least for members of their loyalty programs. Some will even let you add any other person as a free additional driver. For details see:

Avoiding hassles when you rent

Your car rentals should be easy, as well as inexpensive.

  • Join the car rental company’s loyalty program for much faster checkout. At major airport locations, you can often just take your pick of the available cars in the lot and drive away, without any paperwork. At most other locations, you only need to show your ID at a special rental counter and pickup your keys. There is no interminable checkout process and no need to listen to any annoying sales pitches. Unlike the bad old days, it doesn’t cost anything to join the programs, and you’ll save a bunch of time every time you rent. Join Major Car Rental Loyalty Programs for Faster Car Pickup—They’re Free.
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  • Use a credit card that gives you “primary” car insurance (if you have one). Almost every credit card offers insurance for theft or damage to your rental car. However, in most cases, the coverage is “secondary”. If something happens to the car, you’ll still need to file a claim with your personal auto insurance policy. Your credit card will just cover anything that your regular insurance doesn’t. However, a few credit cards offer “primary” coverage, allowing you to avoid involving your regular auto insurance company. This only applies to US and Canadian rentals. In other parts of the world, your regular auto insurance never applies, and almost all credit cards essentially provide primary coverage. Credit Cards That Provide “Primary” Rental Car Coverage.
  • The good news is that if you are following our basic strategy, the Sapphire Reserve offers primary rental car insurance, as well as the best reward rate on car rentals.

  • Take photos of any damage. If you are diligent, you should walk around the car and take a photo of any damage that you see, so you can’t be charged later. While we don’t always do that (even though we should), we also take a picture of the license plate so that it is easy to look up the number at hotel check-in or in other circumstance where we need it.

Get elite car rental status from your credit cards

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One of the benefits of Mastercard World Elite, Amex Platinum, and Visa Infinite credit cards is elite status with one or more car rental companies.

Being an elite member of a car rental loyalty program is nice, but not exceedingly valuable. You get a decent chance of a one-class rental car upgrade and somewhat faster reward earning rate on your rentals.

As a result, we would never recommend getting a credit card, just to get elite rental car status. However, there is a reasonable chance that you already have, or will wind up getting, at least one of the cards; and you might as well take advantage of this benefit. Just having the credit card is not enough. You’ll need to go online or call the rental car company, after you receive your credit card, to set up your status.

  • Visa Infinite Cards. With a Visa Infinite card you get elite status with National and Avis. You also get a 2-hour grace period with Hertz if you book with CDP 2150933. The only Visa Infinite cards are the Sapphire Reserve Card, CNB Crystal Infinite Card, UBS Infinite Card, and the no longer available for new signups Ritz Carlton Credit Card.
  • American Express Platinum. Platinum cards come with National elite status. You’ll also get some special benefits with Avis and Hertz.
  • With Avis, you’ll earn a free weekend car rental (good for two days), if you complete two qualifying car rentals during the first half or second half of the year. To qualify, your paid rentals need to be at least two days long, booked with AWD A756900, and paid for with your Platinum card. You can earn one certificate every six months.

    With Hertz, you get an extra 4-hour grace period when you reserve with CDP 211762. The extra 2 or 4-hour grace periods from Hertz can be extremely valuable. Depending on how long you need your rental car, it could save you an entire day's rental. For example, if you pick up your rental at 1pm and need to be back to the airport the next day at 5pm, you only need to pay for one days rental, rather than two. This benefit is only available at locations in the United States.

  • World Elite Mastercard. Elite status with Avis, Hertz and Sixt. Avis elite status isn't mentioned on the World Elite Master Card Rental Car Benefits Webpage, but is still available through this Avis webpage.
  • Some common World Elite Mastercards include the Citi Prestige, Citi Premier, American Airlines Platinum, American Airlines Executive, Aviator Red, Hawaiian Airlines, Virgin Atlantic, Air France KLM, and HSBC Premier Elite card. The Citi Double Cash Card doesn't come standard as World Elite cards, but can be converted to the better World Elite version, for no extra charge.

Also…

  • If you have the American Express Platinum card, you can get a 4-hour grace period on Hertz rentals. In some cases, this can save you from the cost of an entire day’s reservation. For example, if you are planning to pick up your car at noon and then drop it off by 4pm the following day, instead of needing to rent the car for two days, you'll only need to pay for a single day rental.
  • If you want to take advantage of this, you need to reserve with a special Amex Platinum rate code and book the reservation so that your return time is the same as the rental time. But, when you return the car late, you won’t be charged for the extra hours.

  • You can use National Car Rental Emerald Club Free Rental Days for one-way rentals. One-way rentals can sometimes be extraordinarily expensive. One option is to use any free rental days you’ve earned from National to pay for those rentals. They work for one-way rentals for no extra fee and have no black-out dates. 



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