8.4-11.2 MPG

[CNCwell]

I am getting horrible gas mileage. I do have my spare on the roof until i built a carrier for it, but I wouldn't think that would have this much of an affect. I recently replaced my cam shaft sensor along with the passenger side ABS sensor. I have no warning lights and a scan comes up clean. Any thoughts?

Those are HWY mpg's.

[Trail X]

What's your gear ratio and tire size? I assume I6?

What is your normal travel speed on the interstate. What kind of terrain? When did you notice the change in mileage?

[v7guy]

O2s would be my first guess given no other obvious problems and it's a sudden change since well after the lift.

[navigator]

and if your throttle body hasn't been cleaned in a while it might be worth it to clean that.
Seems like most tanks I average around 15.5 MPG running 32s and 3.42s with about 4" lift.
Most of my driving is rural. I don't dog it or drive like grandpa.

[NC_IslandRunner]

With Baja Rack and my tire on top my truck I only got around 12.5 mpg, so the tire is not helping. Bad O2 sensors could cause crappy mpg as well.

[HARDTRAILZ]

That is a HUGE range of MPG. How many miles were those figures calculated over. Are they hand done figures or the BS the computer spits out?

Do a hand calculation over 2 full tanks at least to get a number worth a shit.

[navigator]

are you considering your tire size change when figuring your miles?
if stock is 29.8 and your new tire is 32.8 that is about a 10% difference in circumference so your miles would be off a factor of 10% (if I did my math right).

[CNCwell]

I'm running stock gears and 285/75/17s. I know that's not a good combo and new gears will come this spring. I average about 70 on the HWY. I make several trips a month from Florence Ky to Columbus OH. The gas is company paid and I pulled those numbers from our fuel report. I had the secondary air injection pump replaced about 6 months ago, but I didn't think about the O2 sensors. I will clean the TB and check those.

[navigator]

those would be what most folks would call "34s" which would make the mileage further off.
"stock" gears can be 3.42, 3.73 or 4.10
Look up the RPO code.

[CNCwell]

I will check that tonight. Thank you

[Trail X]

If you're on 3.42 gears and 34s, I'm not surprised at your mileage.

[navigator]

I would expect the tranny to be nice and toasty as well.

[CNCwell]

Yeah, they're 3.42 gears. Looks like I need to do some work. Also just found out that I have no G80. Kinda sucks. Well the search is on for 4.10s.

[bartonmd]

Yep, the few I6 models with 3.42 and 34-35" tires that I've seen a trans temp gauge on typically run 240-270F trans temps on the highway, because they won't stay in lockup at highway speed, and the I6 has a REALLY loose torque converter that makes a TON of heat.

Mike

[TBYODA]

Yeah, they're 3.42 gears. Looks like I need to do some work. Also just found out that I have no G80. Kinda sucks. Well the search is on for 4.10s.

[Moots1288]

Wow wish people would find axles for me.

[NC_IslandRunner]

Wow wish people would find axles for me.

I'll burn 2 minutes and find one for you, what do you want!:P J/K

[Moots1288]

Wow wish people would find axles for me.

I'll burn 2 minutes and find one for you, what do you want!:P J/K

AW Schucks! You're the best.. maybe a Pro Rock 60

[TBYODA]

Wow wish people would find axles for me.

Hear you go These are 6.0L

[CNCwell]

Yeah, they're 3.42 gears. Looks like I need to do some work. Also just found out that I have no G80. Kinda sucks. Well the search is on for 4.10s.

You are the man! Thanks!