21. Early Return Fees
You’d think that rental car companies might be grateful that you drop off the car a day or two early, but instead they ding you for that. Some will give you a prorated refund for an early return, but others charge you $10 or more for that. If your early return means you no longer qualify for the weekly rate deal, you could be in for some surprising charges.

22. Fill ‘er Up
Rental car companies are upfront about telling you to return your rental vehicle with a full tank of gas or they’ll charge you for the top-up. Ask what their rate is before opting for this convenience – it’s often quite expensive.
