If someone told you there was a way to improve your gas mileage by as much as 55 percent without making any modifications to your car, you’d probably think they were nuts. Now imagine it’s the U.S. Department of Energy telling you that. Some people might still hear the “nutjob” alarm going off, regardless. But according to studies they’ve conducted, you can dramatically improve MPG simply by driving the speed limit and—here comes the hard part for some—letting go of certain aggressive driving behaviors.
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