Hey i have an 06 GMC Sierra 2500HD 6.0L and all i have right now is an intake. Wondering if anyone else has any ideas on what i can do to inprove gas mileage. Im ordering a magnaflow pro-flow exhaust but need more ideas.
Thank you D.J.

 

Custom tune. Nelson Performance!
Drive 65-70mph tops.

Jim

 

What's your MPG?

 

MPG is 9-10 its pretty bad, and i drive the highway to and from work in the oposite direction of all the trafic to its not the stop and go trafic, its pretty smooth sailing

D.J.

 

Not really easy to compare our trucks, but it use to get 14.5-15 average (Hwy & City combined) with stock tune. After tune (took a few hundred miles for PCM to adapt) I began getting 16.5-17 average.
I'll also get a 20-21.5 mpg on a flat out hwy run with "cruise" speeds at 65-68 mph with A/C on, full tank, 3 people, 20" O.E. wheels, tail gate up, with the 3.73 gears, and LQ9 6.0L. My truck is a 1500 series VHO ECSB.
If that helps any.

Jim

 

With a stock 5.3 and mostly easy foot I get 15.599 mpg in the city, but that's driving 2 miles to work and back 5 days a week and an occasional outing to the mall which is ~7 miles.

 

9-10 highway MPG sounds low. Is this a lifted 4WD? I had an 03 1500HD CCSB, 2WD with the 6.0 and I saw 13-14.5 highway. The 6.0 with the 4l80e trans doesn't do nearly as well as the 5.3 with the 4l60e trans, plus you're pushing more weight than a 1/2 ton. What I did to improve MPG was- Airaid intake, Flo Pro exhaust, custom tune, electric fans, and trying to keep my foot out of it. I also did better with using higher octane gas.

 

i had a '04 2500 ccsb 4x4....it got 10-12 on the hiway....magnaflow aftercat exhaust and mac cai and nelson hot tune got me 14-16 with more power...
have a '02 2500hd ccsb 2x4 with same mods and before mpg was 9-11 and after was 15-17....there is a hell of alot of torque mgmt in the 80e's from the factory...

 

Put a blower on it. I heard you'll pick up 2mpg. I don't know if its true but it sounds cool.

 

I think that's only because of the tune you need afterwards.