Ok, I live and have worked in
Ok, I live and have worked in the Rockies mountain states all most of my life, that being said, just how good is their calculations for pulling 80,000# over our high mountain passes, on 5 to 20% grades? My Peterbilt with a Cat and 15 speed, 3:76 drives got 4.5 mpg in the Mtn’s, and 6.5 to 7 on the flat country.
Just curious, most cars/trucks are tested under optimal conditions on a flat track somewhere, I would like to see data on real life comparison.