fuel mileage

[gman]

If any one has the following:
1. 2006 or 2007 chevy duramax with allison trans or
2. 2006 GMC Denali, 6.0l awd with 3.73
What type of mileage are you getting in city, hwy and towing?

[spharis]

2006 Duramax/Allison Crew Cab on stock tires/wheels. 17-20 highway 12-15 town. Towing 12-15 highway.

and it's not an 06, but it is a 6.0L
2002 6.0L 2500HD 17-19 highway 11-15 town; towing 10-13

[evil0ne]

I know you asked a specific question but I will tell you that I am getting 12.5 mpg mixed driving on a 2WD 8.1L 3/4 Ton Suburban with 3.73. I got 11 towing about 15 miles total on Sunday. The 6.0L AWD Denali will probably get 1 or 2 better is my guess.

[Paublo]

I've got an '04 2500HD CC SB D/A that gets 16-18 around town with a little freeway, 18-19 on freeway if I stay at 75 and I get 12-14 towing.

[Domsz06]

2000 f250 7.3 psd, 22 while towing in cali, 14 while towing in every other state in the us. 18 while not towing.

[Tige M.D.]

2001 duramax, best 21mpg dead heading 75mph+ 330 miles, worst 12mpg. towing 75mph+ same distance.
2006 C6 ZO6, Las Vegas to Rancho Cucamonga, 210 miles, 26mpg, 2hrs. 5minutes Would have been quicker if it weren't for the CHP outside of Barstow. Thank you Valentine 1 radar detector.

[G-MONEY]

Has anyone done any Mods to their duramax/ powerstroke to get more HP/ MPG?????....Like a chip or exhaust etc. and how effective were they?????

[Domsz06]

wow tige md, you were flying

[Tige M.D.]

Has anyone done any Mods to their duramax/ powerstroke to get more HP/ MPG?????....Like a chip or exhaust etc. and how effective were they?????

Tried two different ECM programmers. Hypertech and Juice module. Both did make significant hp/torque gains. What really woke the engine up was the RBP exhaust.
The mpg did seem to get better but not much. It was more for the sheer thrill of killing imports at the line. Nothing like wacking a civic with a wing and butthole exhaust. Oh, did I mention filling their driverside windows with thick black soot

[G-MONEY]

Tried two different ECM programmers. Hypertech and Juice module. Both did make significant hp/torque gains. What really woke the engine up was the RBP exhaust.
The mpg did seem to get better but not much. It was more for the sheer thrill of killing imports at the line. Nothing like wacking a civic with a wing and butthole exhaust. Oh, did I mention filling their driverside windows with thick black soot

Ha Ha Ha.......

[Domsz06]

I have done that too to a convertible that wouldn't get off my @$$ so much fun!