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# How to Calculate Gallons of Gas Used

by C. Taylor

At a time when fossil fuel depletion is a growing concern, knowing your fuel consumption allows you to measure your contribution to this problem. Or more important, it gives you a basis from which to reduce your fuel consumption. Knowing the miles per gallon (mpg) is not enough. It might be more valuable to know the gallons used per mile and the total gallons consumed per year.

#### Step 1

Refer to your car's fuel economy, expressed as mpg. This information should be listed in the specifications section of your owner's manual. Two figures are listed: city and highway mileage. For estimation purposes, you an average the two by adding them together and dividing by two.

#### Step 2

Divide that figure into one to calculate the number of gallons used per mile. As an example, if you get 20 mpg, then divide 20 into one. This results in 0.05 gallon per mile. This means that for every mile you drive, you are consuming 0.05 gallon of gas.