Funny. If you were visiting a relative in a far away town I bet you would have better luck asking "Can I plug my car into a spare outlet while I visit?" compared to "Can I have 8 gallons of Petrol?"
Yes indeed, how would this go at the front desk of the Hilton, "I've traveled here in a gasoline powered car, would you mind popping a few extra gallons in the tank for me whilst I sleep?"