Actually, the gas can itself can only hold 11 gallons of gas, that's why you always see the gas man putting in two cans worth of gas during a regular pit stop.
Yes, 11 gallons is what the can is suppose to (and designed to) hold, however, there are some very clever people in Nascar who got as much as "11.7 gallons" from a can, neck, an vent included. That coupled with oversized gas lines, vent tubes, etc., consider stronger tube material with thinner wall thickness. every aspect of race(car/truck/etc.) is scrutinized for what ever edge they can get. Mileage is very important in winning, gastanks, cans, lines, are well thought out.
Though at some tracks, NASCAR mandates a smaller fuel cell to spread out the field (like Daytona and Talladega)
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The gas can that is used by NASCAR pit stop crews is holding 10 to 12 gallons of gas. Usually on a full fill, two gas cans are used. The pit crew tries to have only what gas is needed for a particular stop in the can because if the tank overfills it will cause a fuel spill which will penalize the driver.
18 gallons. The NASCAR rules dictate that the fuel tank of a cup car is 17.75 gallons Yet the gas cans are 12 gallons and it takes two of them to fill it up?
My husband is a die hard Nascar fan. Been so for years. He says 9 gallons!
Actually its 11 gallons...
They are designed to hold 11 gallons, but some teams have been able to get 11.7 gallons from the gas can. (the neck of the can was full also)