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Not typically.

It depends on the vehicle, Large pickups and SUVs with small engines tend to get worse mileage than the same type of vehicle with a larger engine, especially in hills and when towing. The smaller engines have to work much harder for similar results. In cars a V6 Buick can achieve better economy than a 4 banger Honda, it all depends on the manufacture and engines http://fueleconomy.gov/ is a great site to compare cars and engines for economy

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Q: Does more horsepower equal better fuel economy?
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