In my many x country journeys I was being a little OCD about my fuel mileage, I did find that above 68MPH there was a wall that would drop me below the 15 mpg barrier, but below that 68 mph, 16mpg or better depending on headwinds. I assume the raised roof lowers this number somewhat over a non raised roof.
On one 200 mile section under construction I was forced to drive a steady 58 by the Semi in front of me in the one available lane. The mileage did not rise significantly over that of 68mph.
I also find that I can do better than the cruise control in achieving maximum mpg except on the flattest of terrain with a wandering mind.
|