"mileage drops sharply at speeds above 65 as engines work harder to overcome wind resistance that rises exponentially"
I don't know the science behind the theory, but I've realized it in practice. I had a Savage 650 for a bit, and could feel the wall passing 65. Sitting straight up as I was, I really did notice much more risistance pushing back on me as I crested 65mph.
On the ninja i didn't notice it, because of the forward leaning position, my helmet cut thru the air istead of my chest
Highway driving in my 1996 F150 (very square front end) I could feel the truck fight the wind much more at 70mph then at 60mph.
It's not a matter of the cars today. All cars will have a different maximal milage point depending on the engine, transmission (number of gears) and differential ratio.
state police would clean up if they dropped the limit to 55mh.
