I was wondering about refueling rental cars. We always purchase the gas option, but this time we'll be there for a short amount of time. We'll have to leave the BC around 6AM or so to go to the airport. Can I refuel at the BoardWalk Exxon and drive to the airport, and it still be on full? Will the company (DOLLAR) ask for the receipt for the gas? If I show them the receipt for the BW Exxon, will they charge me more? Would it be better to use Budget or L&M in this "fuel case"? I can get similar rates from both of those. Thanks.