For those who have "upgraded" their tires, what has been the effect on gas mileage?

For example, LT285/75R16 or LT305/70R16...was there a noticeable decrease in fuel economy, horsepower, or torque compared with stock tires?

 

No. No. Yes.

The added weight of the tires is offset by the "increased" axle ratio. MPG is a push.

By the time HP becomes important, you're already rolling, so HP is a push.

"Torque" is reduced because of the higher effective gear ratio and added tire weight.

Neal

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1997 4x4 Expedition- 4.6L, true dual exhaust w/glass-packs, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, Optima "T-Bone" wheels, and Clarion In-dash CD player. Just added Smitty Bilt push bars and nerf bars!!

1993 4x2 F150 Reg. Cab LWB- 5.0L, cat-back dual exhaust w/glass-packs, K&N air filter, Superchip, fresh paint, and Line-X bedliner.
http://members.visualcities.com/NoMo

 

Also, if you didn't correct the speedo gear for the tire change, the vehicle will no longer accurately track mileage or speed, causing your fuel mileage to be off as well.

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Todd, Orlando FL.
93 F-150 4x2, 4.9L, E-4OD, 3.08 rearend, 31x10.5 BFG A/T's, Skyjacker Softride Hydro Shocks,K&N Airfilter, Jacobs Electronics Plug Wires/Rotor/Cap. (Next mod: Flowmaster catback exhaust!)