Anatomy of a NASCAR

Passenger cars have these, too, but they're under the car. Race cars don't have fuel gauges, so when the gas tank is full, the excess spills out. A crew member catches the overflow in a can, then measures that amount so the crew knows exactly how much is in the car and can precisely calculate gas mileage. A race car's gas tank holds 22 gallons. The gas comes from a central tank to ensure teams don't add additives. The gas cans used to refill cars hold 11 gallons each and weigh about 70 pounds when full. Racing gas is leaded, 104 octane. Development of an unleaded racing fuel is a year or two away.

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