There is one example I can think of. You pick up a car, don't check to make sure the starting mileage on your contract and the odometer on your car match. Then you drive less than 75 miles and return the car. You know you drove less than 75 miles, but the computer thinks you drove further because the paperwork shows you took out the car 100 miles ago. Now you're charged for a full tank of gas at the ridiculous rate rather than the 75 mile gas fee (which is still ridiculous but a lot less than a full tank).