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Its tinier because it takes less power to move less weight. Gas weighs about 6lbs per gallon, so if you've got a 20 gallon tank, you're hauling around an extra 41 lbs just in gas compared to a standard 13.2 gallon tank.
Too many other factors to consider for MPG (gear, speed, total vehicle weight, driving style, drivetrain, engine load, etc).
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2013 Firestorm 6MT Scion FR-S |