I've got an 88, 351 EFI w/ 32" Mud T/As. I also get 11-12 MOG overall. My tires are abot 12% taller than stock, so I take my odometer readings and add about 12%, giving me 11-12MPG. On the odometer it reads closer to 10MPG. Broncos are thirsty!
78, 3" suspension lift, 400, NP435, 3.50 with 35X12.5's, I get around 9 (corrected for larger tires)...and that's a lot of highway!! 4.56's with Detroit Sof Locker rear and True Trac front are in the works.
11-12 MPG sounds pretty good considering you're pushing something down the road with the aerodynamics of a barn, lots of rotating machinery and a whole bunch of mass. Take it off-road and things go down hill real fast
'79 351M, 33/12.50 Mud Terrains and stock gears, new intake, carb, headers and a few goodies, when primed and timed (on a recent south beach trip), 14.3 MPG highway (corrected for tire size), 6-7MPG for the beach run. The highway mileage was surprising, but I wasn't mashing it to reduce enforcement visibility...
Hey you guys are doing pretty good. I get about 8-9 mpg's and that even highway/city driving. I have made a few mods and I'm running 35" BFG's. I have a 351W fuel injected and there really isn't much I can do about the mpg's. With the exception of losing weight on my lead foot.
88 Bronco, 302 AOD, no lift yet31" A/T's... I get 16-18 mpg on highway, and almost the same around town. Only 14 miles round trip each day to work. I'm getting ready to swap in a
302 roller motor with B303 cam, MAC shorty headers and a new exhaust... We'll see what happens to the mileage then!