So now, we have become accustomed to the choice of refilling the tank before returning the vehicle...or paying an additional fee if the rental car company has to do it. Usually, it's a buck or two on top of the per gallon charge (i.e., if gas is $2.59, it's not unusual to pay $3.99 or $4.50 a gallon).
Seen earlier this week at two airports: $8.49 if they refill the tank. That's a SIX DOLLAR per gallon service fee!
Thus, that's not a service fee. That's robbery.