Forget miles per gallon—here's the best metric for measuring a car's efficiency

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Forget miles per gallon—here's the best metric for measuring a car's efficiency
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It's been right there on the vehicle's sticker all along.

Photo by Erik Mclean on Unsplash“Your mileage may vary.” That’s the disclaimer carmakers apply to the Environmental Protection Agency fuel economy ratings that are listed for their cars.

This is the gallons-per-100-miles rating. Although it is in smaller type than the miles-per-gallon number, it should figure larger in your calculations when comparing cars. That’s because the gallons/100 miles rating makes it easier to compare the efficiency of different cars and estimate their likely annual fuel cost.

The advantage of measuring fuel consumption this way is that it makes comparisons easier as fuel efficiency improves for a specific vehicle. That’s because the differences are linear. With miles per gallon, efficiency is graded on a curve. For example, for a 15-mpg car, a 5-mpg improvement is a 33-percent gain. But that same 5-mpg upgrade for a 30-mpg car is only a 17.5-percent improvement to a vehicle that is already using half as much gas.

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