You know those annoying extra fees that airlines charge for checked bags, preferred seating, and even pillows and blankets? According to USA Today (Nov. 3, 2010 "Rental Car Help on the Road Could Cost You"), car rental companies are now charging for roadside assistance to fix problems they judge to be caused by the driver, not the rental car itself. The largest car rental companies charge from $49 to $67 to fix a flat, charge a dead battery, or deliver fuel if you run out. They'll charge $57 to $73 to get keys out of a locked car and between $200 and $375 to replace lost car keys. To avoid charges, you can pay at the car rental counter for "roadside assist coverage" that costs $2.99 to $4.99 per day depending on the company.
Tip: Check with your auto club's roadside assistance program, such as AAA, or your car insurance provider. Some programs include roadside assistance for rental cars.