What is the optimal speed to drive on a highway for good gas mileage?
I remember reading of 35mph being the WWII speed limit in order to conserve gas. It probably varies from car to car, so for the sake of argument let's just use a current Honda Civic with the standard v cylinder engine as a point of reference. Anyone have any thoughts?
I was always told that engines were designed for their maximum efficiency at 55mph. I don't know if engines have been "tuned" to operate more efficiently at higher speeds.
I get 40mpg in my 98 Civic 5 spd with avg speeds of 55-65mph. That's average around town/ highway mix. Much of the savings come from modest acceleration and anticipating traffic. The rest comes through coasting as much as possible and keeping the speed up to avoid downshifting. Of course traffic and police have an adverse effect.
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