For comparison I have a BHW swapped 2003 Blazer,5 spd manual, weighs about 4200 lbs, 215 75 15 tires. I do all my mileage calculations based on the imperial gal.
It averages right around 40 mpg (33.3 us mpg) on most of our trips, usually loaded pretty heavy on the return trip. Last year we did a...