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My car has a fuel consumption curve that is flat from 30mph to 65mph, and drops only slightly at 70mph. My Cd is low enough that the slight increase in aero drag from 30 to 65mph is offset by the increase in ICE efficiency as I increase the load on it. It is actually easier for me to get good mileage at 65mph than at 30mph because at the lower ICE loadings (barely above idle), the throttle/mpg relationship becomes super sensitive. I have to use the hand throttle to consistently keep getting the better mileages at the lower speeds.
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