CAMBRIDGE, MA - Knittel found that between 1980 and 2006, the average gas mileage of vehicles sold in the United States increased by slightly more than 15%. During that same period, though, average curb weight of those vehicles increased 26%.
CAMBRIDGE, MA - Knittel found that between 1980 and 2006, the average gas mileage of vehicles sold in the United States increased by slightly more than 15%. During that same period, though, average curb weight of those vehicles increased 26%.
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