I drive the NYS thruway about 70 miles to work each day at exactly 65MPH.
Lately I've been getting 40.+ each way. Even when bucking a headwind, I can still get 38.+mpg.
Up hills I just tap the cruise control down 1 tap at a time to keep the eco lite on and then return to speed when I'm over the top. Best trip so far....42.6 mpg...with a tailwind.
hans