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How do car makers calculate their cars city/highway miles per gallon?

April 26, 2017Autos CALCULATE car cars city fuels gallon highway makers miles Transportation

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How do car makers calculate their cars city/highway miles per gallon?

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They base mpg on one gallon of gasoline, on flat laboratory rollers, at 30 mph. not very realistic, since no one goes 30 mph, anymore. its all a shot in the dark. For a realistic mpg, take the advertised high mpg and the low mpg, add the two figures and divide by two.