i have been logging the mileage and fuel costs for the burban i have, 82 with a 6.2, unknown mileage, odo says 24493...who knows exactly. i bought it with 22642 miles on the clock, has 24493 on it now, i put a total of 75.5 gallons of fuel in it, at a cost of173.50 :draw . by my calculations, thats 24.5 miles per gallon!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!, and after the b&m shift kit set up for r/v towing, it runs great, shifts good and has a considerable amount of power than when i bought it. now just to deal with all the rust