My Dad has a 1967 AH Sprite sports car. He was accutely aware of how much gas was in the tank but never payed attention to the milage. I would ask to take the car to a friends house about 4 miles away and since I had no money to buy gas, he felt safe that I would not go too far.
I would then go to the gas station in our small town and help the old guy close up shop. Recording numbers off the pumps, putting away the tire racks, mopping the garage floor. In return he would let me pump 3-4 gallons of gas.
I was gone for most of the night tearing up the back roads of Contra Costa County.
At least I was earning my own way to irresponsibility.