Re: mpg when going from stock to 35" tire
yep mine are exactly the same as yours , i have 31.2 inch tall tires (measured with a tape) thats how i figured i have 4.10 gears.
2000 f250 ECSB Dually 4.10s 305/70/16, 4x4 7.3 zf6 200k miles
Php hydra chip PHP tuned! 4" exhaust, stock turbo(ww2, turbomaster wastage actuator, gutted ebpv), FRX, 160/30 sticks SB 1939-CB single clutch, home brew water setup for when i'm pulling hay through the mountains.