This was an unusual situation. Normally, a car rental place gives me a car full and tells me to return it full. With Enterprise, they gave me a car 1/2 full and told me to return it 1/2 full, knowing that it's difficult to measure as I'm filling the tank and that I would err on the side of putting in too much, giving them extra gas on my dime.
Pretty sneaky, sis.
Mike