i think to be perfectly fair you should take whatever route but then take the exact same route back to where you began...that will cancel out and windage or elevation effects on the mileage...
only saying it becuase i get much better mileage on my home from the mountians then i do on the way there
I guess i forgot to say what route i did take exactly. Im in flatlands so there arent many hills. But i went from lawrence, ks to pittsburg, ks and turned around. Took the exact same way there and back. Just drove around a little while i was at pitt.
Thats damn good there mad max!!