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Basically, the more you put into it the more you get back. There are a few simple things that can really help such as a grill block and inflating your tires to the max sidewall pressure. However, after that it starts to become more work for less return. Driving techniques are really going to be the main way you gain FE. But, take a look at the aerodynamics forum. Since you drive a lot of highway you'll get a lot of good tips there that should help with your mileage.
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