The following is from the US Department of Energy: “While each vehicle reaches its optimal fuel economy at a different speed (or range of speeds), gas mileage usually decreases rapidly at speeds above 60 mph. You can assume that each 5 mph you drive over 60 mph is like paying an additional $0.24 per gallon for gas.”
I have found this to be true in my own experience. Stop and go traffic will cause you to get worse mileage as will fast acceleration. Going a consistent speed is the best way to get better gas mileage.
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