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The answer depends on how fast you will be driving and the gas mileage of the vehicle.

You take the average speed of the trip (in miles per hour - mph) and multiply it by the number of hours driven (21 in your question) and divide the result by the gas mileage of the vehicle (in miles per gallon - mpg).

For example: A vehicle that gets 20mpg, traveling at 60mph for 21 hours will consume 63 gallons of fuel. (60mph x 21h = 1260miles / 20mpg = 63 gallons).

Tip: Be sure to use the highway mpg rating of the vehicle if most of the trip is driven on highways.

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Q: How much gas do you need for a twenty one hour drive?
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