Between $9 and $11 per gallon is typical at major US brands (Hertz, Enterprise, Avis, Budget). That's about 3× the retail pump price. On a 15-gallon tank returned half-empty, that's $70+ in fees for fuel you could have added yourself for $25.

Almost never. Prepaid fuel means you pay for a full tank at pickup regardless of how much you use. Unless you plan to return the car empty (which is hard to time perfectly), you're leaving paid-for fuel in the tank. FillItRight's cost comparison shows the break-even point.

Close but not perfect. Most gauges read within ¼ of a tick, and tanks read slightly lower once the car sits still. FillItRight lets you pick the nearest ⅛ increment so you don't over- or under-fill. If you're unsure, err one increment higher — unused fuel costs less than a refueling fee.

Use Step 3 to enter your current location and the drop-off address — FillItRight calculates the exact gallons you need for the drive plus the return-level target. That way you can fill up earlier and still return at the right level.

Yes. FillItRight auto-detects your currency and unit (liters vs. gallons) and uses regional fuel prices for the cost estimate. Works worldwide.