horrible mpg on 03 yukon

[hotshottt06]

i did a search but couldnt really find what i was looking for..ok i have a 03 yukon with a 6" RCD + 3" body on 35x12.50r20 mud grapps. it has 58,ooo miles with routine oil changes, tire pressure is good. im gettin 9 MPG is this normal?? im not expecting amazing mileage but shouldnt i get 12-14??? i have a K&N intake which didnt help, i drive much more economical and still no change. any suggestions or comments would be greatly appreciated!

[4x4chevydude]

it seems about right maybe try changing the fuel filter and seafoam the truck...look into a tune or a chip and do a tuneup couldnt hurt

[hotshottt06]

probably a noob question but what is seafoaming?

[chevytaHOE5674]

Are you regeared for those heavy wheels and tires?

[bigdeere87]

gears could be an issue. also are you running E85? im assuming that its a flex fuel vehicle and if your running the ethanol you will see a pretty good decrease in milage

[chevytaHOE5674]

Originally Posted by bigdeere87

gears could be an issue.

I'm figuring heavy 20" wheels and heavy 35" tires probably on 3.73 gears, needs some 4.56 or 4.88's to get it back in the power band.

[DarkCharisma]

Gears would be the biggest boon for mileage on that beast. 4.88's for sure. Look into a custom tune, but there's not a whole lot you can do for a 6k lbs brick driving into the wind.

[sonjaab]

Normal mpgs. for those mods.............
You could be getting less!

[S/C Z71]

You need gears.

[maxwell1]

great looking ride!

mpg!!!! it takes fuel to move heavy iron.

if mpg is important, go back to std tires wheels

synthetic oil in all drive train systems
check rear brakes for dragging, if drums on back.
increase air pressure to 3 or 4 psi over std in all tires
complete tuneup using ac delco parts
fuel system cleaning
drive it like your grandmother would drive it.

[ksukats57]

Probably not a flex fuel vehicle. You need to regear, and you may actually be getting better mileage than that your speedo might just be off.

[Joe]

Originally Posted by maxwell1

if mpg is important, go back to std tires wheels

[daved931]

Gears and a tune.

Seafoam is an engine cleaner. You suck it through your brake booster vacuum line into your intake and then your truck blows smoke like a satanic diesel. Pick a bottle up at your local parts store and follow the instructions.

[retired wrench]

You might consider walking. I read that the average person walks 900 miles a year and consumes 22 gal of alcahol,thats over 40 MPG.

[DarkCharisma]

Originally Posted by retired wrench

You might consider walking. I read that the average person walks 900 miles a year and consumes 22 gal of alcahol,thats over 40 MPG.

lmfao.

[hotshottt06]

im curious to try the seafoam...ive wanted to regear for a ahile but the only shop around that i think would do it estimated like $3000 for front and rear 4.88. is this a normal price for parts & labor? maybe i should try the dealership?? also how would i go about getting a custom tune

[Hotwheelz]

Originally Posted by retired wrench

You might consider walking. I read that the average person walks 900 miles a year and consumes 22 gal of alcahol,thats over 40 MPG.

LMAO!!!

[Hotwheelz]

Originally Posted by maxwell1

great looking ride!

mpg!!!! it takes fuel to move heavy iron.

if mpg is important, go back to std tires wheels

synthetic oil in all drive train systems
check rear brakes for dragging, if drums on back.
increase air pressure to 3 or 4 psi over std in all tires
complete tuneup using ac delco parts
fuel system cleaning
drive it like your grandmother would drive it.

don't over inflate your tires, the tread in the middle of your expensive ass tires will suffer.

[metalhead]

Regearing did it for me. I had 3.42's before and was getting 10-12. I've got 4.11s now and am getting 15-16

[hotshottt06]

expensive ass tires is right im due for a new set and it sucks!!
heres a pic in the rain just for sh**s and giggles..