How To Improve 6.0 Gas Mileage?

Joe Daddy · January 17, 2010

My 2003 has been getting 9 lately. I'm going to check out a diablo sport and K&N, the lose the muff for a after cat straight pipe and see if that helps. CCSB 4x4 6.0

Rog Man · January 17, 2010

My 06 2500hd gets 16 mpg highway or city it doesn't seem to care.

The only thing i did was go to a 265/75/16 from the stock 245.

Now once winter hits and 4x4 is engaged thats a whole different story,

then it drops to single digit mileage.

Prokopchuk_9 · January 17, 2010

with a 6.0 you aint gonna get much, id start with cold air intake, synthetics font and rear diffs. and royal purple ATF...that'll help you a bit too.. other than that 1-12 MPG is about the norm for a 6 litre

Prokopchuk_9 · January 17, 2010

My 06 2500hd gets 16 mpg highway or city it doesn't seem to care.
The only thing i did was go to a 265/75/16 from the stock 245.

Now once winter hits and 4x4 is engaged thats a whole different story,

then it drops to single digit mileage.

hey fellow albertan, is that duramax for gasser? if its gas thats pretty good lol

pappastratos · September 26, 2013

Bumping this one back to life !! I recently bought a nice 2002 2500HD 4x4, owned by a elderly guy who passed. This truck was garage kept ! Got it a good deal plus it ran better than any of the 1500's at the same year I looked at. BUT the mileage stinks !! Luckilly its just a weekender. I bought mainly to pull my 19' boat & to go to yard sales & lowes. Thought about selling for something smaller, but it runs & shifts good. You can literally watch the gas guage move !!