Question 1

Why might MPG differ from the vehicle’s rated EPA value?

Accepted Answer

Real MPG depends on driving style, terrain, weather, vehicle load, and idling. Rated values are tested under standardized conditions that may not match your route.

Question 2

How should I measure fuel used?

Accepted Answer

Use the difference between fuel purchases for best accuracy, or record fuel added and tank levels consistently. Small measurement errors can noticeably affect calculated MPG.

Question 3

Does this include taxes or maintenance costs?

Accepted Answer

No. Gas mileage focuses on fuel economy. Add other costs separately for a full cost-per-mile budget.

Gas Mileage Calculator

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