Tobin

Just put a set of 35's on my truck with 48RE and 3.73:1 Axles. Smarty on level 1 and speedo corrected right on (using GPS) seems like fuel economy went way down. I have been driving it pretty easy, but overhead stays in 15-16mpg range were it used to be almost in the 20mpg range (I know not accurate)

Going to try bumping up the Smarty to see if that helps. Anyone have any suggestions or experience with the same setup?

Tobin

Fort Ram

When I was running 35's with a leveling kit and Superchips on Performance setting I was getting 17-18 town and 20 highway. Now with a 6in lift and 37's I get 15-16 town and 18 highway. I too have the auto and 3.73 gears. Hope that helps.

kjp

I dont have quite the same set up as you, but when I added my KORE and 35s I lost a lot of milage and power because of the added rolling mass from the larger tires.

stroker101

i reprogrammed tire size with my BDTD programmer. you may need to also.
overhead will read as high as 25mpg doing 50mph

Tobin

Computer is programmed for 35's, and is dead on according to the GPS.

Anyone have any ideas to improve the fuel economy? Injectors bad?

Tobin

Texasimport

been running 35s for 40K and with SMARTY JR as shown in my sig. I get just over 20/21 HWY and 18/19 city hand calc.

Little03

I had a 6inch lift and 35's I got 18-19 highway. With mods in sig. Of course the programmer was on highest settting.

Danderson

Go back to stock tires. I lost power and economy going to 285-75-17's and they are not as tall,nor nearly as heavy as yours. Toyo sells a 285-75-18 which is narrower and lighter than what you have although just as tall, but it would require a rim change.

carbuff415

Typically, Mud Terrain tires will not get as good of mileage as an All Terrain tire of equal size. Then again not getting stuck is worth the mpg loss if a M/T tire is neccessary.

justsayer06

with smarty on 9 i got around 18 hand calculated all highway except about 50 interstate miles im hoping my snow will help out i think i got 3.73's but cant find it on the door where are you finding ur gear ratio at

joe189man

I just ran my first tank with the new tires and rims in my sig, no lift, 38K on the clock and all highway miles down to denver and back and up to the ski resorts and back i got 18.7 i think with jr POD on sw3 75% i have noticed that in town driving i have lost a lot of torque off the line

Patrolman808

Mine went from 15.5ish stock to 12.5ish stock. After the lifts and few mods I did I still didn't see any noticable improvement in mine. Probably because I liked listening to the exhaust too much.

woodrep

There usually is a sticker stuck to the inside of the glovebox with this data on it.

Pooter

Auto/3.73s with 4" lift/35s and im getting about 15mpg, best I got bone stock was 16mpg anyway...
Even with 37s it hovers at 15mpg.(All hand calculated)

Need95-00CTD

I still get about 18mpg with my 24V on 35" X-Terrains.