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I know that simply slowing down from 70 to 65 can give about 3 MPG improvement on my car, so yes, slowing down is probably the easiest and cheapest mod you can perform. Of course, if you have to drive through traffic, it's recommended to stay in the right lane and not go more than 5 below the speed limit, just for safety reasons. But if you're driving at a time without much traffic, 50-55 seems to be a sweet spot for most cars on highway driving.
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