LLY: Junk Mileage - Any thoughts?

[Cougar281]

I've been noticing for a while now that it doesn't seem to matter what tune I have or how I drive, my truck ALWAYS seems to get between 15 & 16.5. I got 16.x going to and from Indianna on Saturday @ about 70. Stock ride height, 265's. What could affect it and what I should check? I've got what appears to me to be a lot of blowby (I can see a bunch of "mist" coming from the PCV Reroute tube, the oil fill if I pull the cap, an oil slick on the frame by the end, and I can always smell the blowby). I can't do a compression test as Glow Plug 5 won't deaprt the head. All balance rates are "within spec". Any thoughts?

 

[WTF]

i stay around 55-65 and get 18.5 on the grape vine with stock tune on 35s i would say just to try slowing down and see if it helps i know if i do 70 im getting 15-16

 

[TheBac]

What kind of mileage do you get in the summer? Its probably a winter fuel issue.

 

[Cougar281]

What kind of mileage do you get in the summer? Its probably a winter fuel issue.

That's the wierd thing, it always seems to be in the same area. It doesn't seem to have dropped any from what it was a month or more ago.

 

[TrentNell]

Just a few simple things , MAF sensor cleaning , clean air filter, fuel filter , check for small boost leaks . Only things i can think of at the moment .

 

[22eco]

i stay around 55-65 and get 18.5 on the grape vine with stock tune on 35s i would say just to try slowing down and see if it helps i know if i do 70 im getting 15-16

^^^^^ do you have a youtube video of that thing getting stuck? I think I seen it..

I've been noticing for a while now that it doesn't seem to matter what tune I have or how I drive, my truck ALWAYS seems to get between 15 & 16.5. I got 16.x going to and from Indianna on Saturday @ about 70. Stock ride height, 265's. What could affect it and what I should check? I've got what appears to me to be a lot of blowby (I can see a bunch of "mist" coming from the PCV Reroute tube, the oil fill if I pull the cap, an oil slick on the frame by the end, and I can always smell the blowby). I can't do a compression test as Glow Plug 5 won't deaprt the head. All balance rates are "within spec". Any thoughts?

I normally get 16ish MPG when I am going about 75 it gets way better around 55... I can get like 20 crusing at 55 with no tune and all stock except blocker plate..

Air filter and fuel filter should help, do you run diesel kleen through it regularly? if not try that too

 

[whitetrash21]

My junk gets 15-16 around town. Like eco said, drop it to 55 (not) and it goes up to 20 or so.

With the blow by issue, is there a lot of diesel in the oil??

 

[22eco]

My junk gets 15-16 around town. Like eco said, drop it to 55 (not) and it goes up to 20 or so.

With the blow by issue, is there a lot of diesel in the oil??

well I tried it once but I cant seem to keep my foot off of the floor... but I need a programmer so i get more power my truck is slower than my sunfire right now... programmer should help with the MPG too

 

[whitetrash21]

well I tried it once but I cant seem to keep my foot off of the floor... but I need a programmer so i get more power my truck is slower than my sunfire right now... programmer should help with the MPG too

Wierd. Im stock except for a pipe and intake and mine gets up and goes just fine.

What all you have done??

edit: blocker plate is all?? with no tune?? how you keep the CEL off??

 

[22eco]

FE9 truck so it never showed up idk... it runs 16.6 in the 1/4, ambient tems were like 90*

 

[TeaBagger2006]

call me crazy but i like those numbers.... i changed my fuel filter a couple days ago and averaged 3/4 mpg more....with this mpg crap there are so many things that affect it

 

[lotsofmiles]

is your speedo/odo correct with the 265's? and tire psi?

 

[Trotorx2]

My truck is the same it doesn't matter how I drive or which tune I run it gets the same mpg. I get around 15 in town and between 17-18 on the highway. I can't believe there is this much difference with these trucks.