The time has come for me to look for a different truck...As it turns out I have need of more cab space then my regular cab 06 can provide...I would like to go back to a manual trans but I am a bit leary of the G56 with it .80 : 1 OD ratio...I am looking for feed back from G56 owners on what kind of mileage you are seeing as well as which mods helped the most...Chances are that I am going to be getting an 05 because I really prefer the interior of the older 3rd gens to the newer ones...I would love to get an NV5600 but those things are impossible to find these days...Any input would be greatly appreciated...TIA

Moose

 

My wife has the 05.5 with the g56 it works great. gets 17 mpg when the exhaust was stright piped it was getting 21 mpg. The dealer put the muff and res back on before we bought it. Got the edge juice with att works good. lots of power will be buying a smarty soon

 

wife has got 20 out of mine hand caulculted with quad crazy larry intake 5 ich exhaust i only get aroud 15

 

I'm getting around 19.5 to 20 on the interstate running 70 to 75 at 2300 to 2400 rpm's, i would say that isn't to bad considering....the inline six motors always did get way better fuel milage than the bigger V8 motors, i would say there is a good chance you won't have any problems with the G56, i have 23,000 miles on mine with no issues, by the way my truck is stock with the acception on exhaust and intake!


Chad

 

Well look who decided to join the party! I know Chad and another one of my good friends have the new trans and both like them very much. Seem to be doing good on mileage, only thing I have seen is they dont like high hp sled pulling.

Andy

 

I get 18-19 out of my dually 4x4@65mph.

 

I'm getting 17-18 out of my srw 4x4 @ 60-65mph. Altitude plays a role in my mileage, I'm at 7K ft elevation. When I travel at lower elevations I get a little better mileage.

 

I get 17 - 18 city/highway.

I got 14 pulling my dads 7000lbs boat labor day weekend.

 

best i've gotten out of my 06 was 20mpg, thats keeping it around 60mph. going to florida i got 17 going 70-75 mpg

 

The milage on the truck is also a factor. when mine was new the best I got out of it was 14.5mpg. Around 30k miles it started getting better, but this is also when the stock muffler and catalytic converter came off.