CTD and 35's how is MPG affected?

[matt lytle]

Straight to the point, and yes I searched but not enought solid info.

98 ctd, 4x4, ex cab, shortbed, auto.

Thinking about picking it up to drive daily, tow a toy hauler and the quads. I was just wondering how a lift and larger tires affect MPG street and HWY, throw me some real world numbers on how your lifted CTD's do.

Thanks in advance

ML

[pcorssmit]

I didn't notice any significant effect on (corrected for size) milage, either going from stock 245/75s to 255/85, or from 255/85s to 315/75s.

Pete

[TRD]

I get higher milage on the freeway (lower RPM) when cruising nice

Around town is about the same as far as I can tell.

It does make a noticeable effect on power

04.5 CTD 600 w/ 6spd

[jeepguy1]

TRD is correct that it does make an effect on low end horsepower, at least it does for me. I have a 2004, 3500 4x4 DRW 6spd, and went from a 235/85/17 tire, to a 315/70/17 and I could definitely tell the difference. You can do several things to correct this. Either, you can advance the timiing. You could also chip it, but that is a little more pricey. Finally and the most costly, you could alwasys regear.

[Blair]

01 ho 6 speed 3.55 gears bullydog chip bhaf straight piped with 315's and it gets about 1 mpg worse around town with the work trailer and 1.5 mpg better on the road empty than with the stock tires. I have seen just a hair over 20 mpg freeway and with a 5000 pound construction trailer on the back six days a week I see 15-17 mpg in local driving. No power problems either on you get it rolling.

[jstarnes]

I got 315 Bfg AT's and I get 20 if I pussy foot it mostly highway back and fourth to work/home

6-7%grades at 75-85 hurt me:flipoff2:

[DutchTJ]

depends on the axle gears ;)