1. Prepaying for gasoline.
Prepaid gasoline charges appeal to our desire for simplicity while traveling, and also to concerns about being late for flights, as every few minutes added to the trip to the airport create more risk for arriving too late to board. As airport security has added considerable time to this process, rental companies have come up with new options for car refueling, and are giving them the hard sell at the rental desk.
Unless you are completely sure you will return the tank empty, or you have a pre-dawn flight that would make it worth the money not to have to refuel, don’t fall for this one. Even the option where they charge you only for fuel you actually use is tipped aggressively in the rental agency’s favor because the cost of having them refuel your car is always higher than the cost of doing it yourself.
2. Failing to check on your way out for a place to refuel on your way back.
The best time to find a place to refuel your vehicle is immediately after you pick it up. As you are driving away from the airport or rental agency, take note of the local gas stations, and make a plan to return to the most easily accessible or best-priced of them at the end of your rental. The road and neighborhoods around airports can be confusing and unfamiliar, so you don’t want to be driving in circles looking for a gas station as your flight time approaches. Figure this out on your way out, when you are not pressed for time.
3. Purchasing insurance, reason No. 1: your own auto insurance covers you.
Before accepting this one at face value, it should be emphasized that auto insurance policies can vary considerably, so you will want to check with your own insurer directly. If you have the minimum legally permissible coverage, it may not include coverage for rental cars — whereas if you have what companies call “full coverage,” it almost certainly does. Call or email your insurer to find out.
In general, the rule of thumb is that the coverage you have for your main vehicle extends to your rental vehicle, because the rental is considered a replacement vehicle under the policy. So if you have comprehensive coverage on your own car, your policy would also give you comprehensive coverage for the rental vehicle.
Most policies will cover you even if the rental car is a “better” or more valuable car than your own car, so you don’t have to worry if you get an upgrade or rent a much better car than the one you insure at home.
It is worth mentioning that an accident in a rental car will typically raise your rates if you have to make a claim on your own insurance policy.
4. Purchasing insurance, reason No. 2: your credit card covers the rest.
Anything your own car insurance does not cover, it is likely that your credit card will. In some cases the credit card coverage is as good as or better than your auto insurance; in others it is intended to be secondary insurance to help cover anything your auto insurance does not.
Of course, you will need to pay for your car rental using that card; just having a qualifying credit card does not give you any protection.
5. Ignoring one possible caveat: “loss of use” insurance.
A new-ish fee applied by car rental companies in the event of a damaged vehicle is “loss of use” charges, which are applied for the potential revenue lost when one of their cars is off the road during a repair. This is typically charged in the amount of a day’s rental for that vehicle, and most auto insurance companies do not cover this fee. Many credit cards do, however, as shown in the link above; American Express, Mastercard and Visa all offer “loss of use” coverage with rentals paid for with most of their cards.
6. Ignoring potential offers for upgrades.
In the past, I’ve recommended reserving a low-priced car and then inquiring about upgrades at the rental desk. This works best at busy times when the garage is running low on lower-priced cars, and may offer you free or very affordable upgrades to a larger car class due to inventory management issues.
In most cases, the desk agent has considerable discretion in setting upgrade rates, so if he or she asks if you are interested in a larger car, respond that it depends on the price; you might find yourself in a much bigger and better car at minimal additional cost.
7. Failing to check for AAA, AARP, reward program or other discounts.
Many membership programs establish relationships with car rental companies as a member perk. These include travel organizations like AAA, airline frequent flier programs, age-specific organizations like the AARP, and even some sports- or hobby-focused groups. Rental car discounts are typically listed on the organization’s website; you are already paying membership dues, so have a look before booking and you could find a great deal.
8. Making too cursory an inspection upon departure.
When you pick up your car, check it inside and out for anything that could potentially be considered damage before you drive away. Look for scratches, scuffs, loose parts, working power windows and mirrors, and more.
Keep an eye out for problems both small and big; the tendency is to take a quick walk around the car looking for scratches and blemishes, thinking that big problems would have already been noticed, but this is not always the case. I once rented a car that had a loose back bumper that the car rental company had not noticed previously. If I hadn’t caught this before we left the garage and an inspector had seen it later, I would have been held completely responsible — I would simply have thought that someone had banged into the car while it was parked, and that it had happened during my rental.
Your best protection here: take photos or a video of a slow walk around the car, and “kick the tires,” so to speak.
9. Leaving final inspection to chance.
Recently, the procedure of returning cars has come to resemble checking out of a hotel, where you leave your keycard on the night table and head out the lobby door with only a wave to the front desk — no more official checkout, key return or interaction of any kind needed. Car rental returns have taken on a similar feel; as often as not, you follow signs to the back of a row of recently returned cars, take out your stuff, leave the key in the car and walk away without ever speaking to anyone directly.
If it feels unsettling just to leave the car without an agent checking it over, it should; the most serious complaints about car rental companies in recent months have been disputes over damage claims. If no attendant is present at dropoff (and sometimes when there is), the dispute later becomes your word against theirs. Unfortunately the terms of the contract, and the fact that the rental company has your credit card number, makes it very hard for you to win one of these disputes, at least not without considerable expenditure of energy, resources and potentially money (for a lawyer, court appearance, etc.).
Again, your best protection here is to take photos or a video of a slow walk around the car.
10. Crossing international borders.
Most U.S. car rental agreements do not allow you to drive the car across international borders (which means to Mexico or Canada for domestic rentals). Additionally, your U.S. car insurance rarely covers international car rentals, so you will likely want to purchase insurance from the rental company at the time of rental.