By Michael Harley, Auto Blog
The good news is that the average fuel fuel economy of the entire US light-duty fleet improved by 40 percent over the past four decades (increasing from 13 miles per gallon to 21.6 mpg). The bad news is that Americans drive more, and with fewer passengers in each vehicle, undercutting the impact of the fuel economy gains.
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https://www.autoblog.com/2013/03/09/fuel-economy-gains-of-more-efficient-cars-undone-by-increased-tr/
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