Good writeup on NASCAR and those fuel problems

The Math of Fuel Mileage » Building Speed: "Average mileage under green is about 4 miles per gallon. At a one-mile track, than means one lap (one mile) requires one quarter of a gallon, which is one quart. A car running out of gas coming out of turn four is short by probably a cup of fuel. On the one hand, it’s amazing that it takes a whole quart of gas to do one lap. On the other hand, the fuel cell holds 18 or 19 gallons. Let’s say they get 18.5 gallons in the fuel cell – that’s 74 quarts, so you’re talking being off by 1/74th of a tank, which is a pretty narrow margin of error."