truck is a stock 2010 4x2 crew cab XFE with a 5.3/A6, lowered on 22s, bed cover

stock gear was a 3.08

driving to work and for the first 5 months of owning the truck i got 18.5 mpg, the drive consists of some stop and go and alot of 50-60mph driving

i recently installed some 3.90 gears

the same drive to work netted me 24.5 mpg on 87 octane! I have tuned the truck with Hptuners to optimize the active displacement. I also tuned the A6, removed the TM and zeroed the converter slip, a handful of other changes. the truck cruises effortlessly in V4 mode.

ill continue to test results this week and see how it does, i expected it to fall in the 22mpg range. 24mpg was a shock,


hope this helps anyone deciding on changing some gears. i really only changed them to help tow my camaro.

 

where did you get the gears and how much ??? I HAVE A 4X4 THOUGH ON 33"S

 

ebay gears, 3.90, 4.10s were too much money

gears 110 shipped new
pinion bearing 86.19 from dealer
55.00 ratch install kit from summit
125.00 install, friend i usually use

gears are as quiet as stock, but the truck runs like it should.

 

Gotta love a full-size truck on 22's that gets 24mpg! Hows it run with the skinny pedal to the floor?

 

it seems better but i couldnt tell if it was faster, today i got on it the first time since the swap. but,... i was driving the jeep srt8 all day earlier so i couldnt tell. ill take it to the 1/8th mile thursday to see.

 

Damn, making me think maybe i dont need the 6.2 after all...

 

IMO, the average from one trip isn't really a comparison to a 5-month average. Run it for at least a month and it'll probably drop down a little. Your guess at 22mpg or lower is probably closer to the real average.

Still, great results.

 

yup thats what im looking at right now.. just maybe buy a jeep srt8 and calling it a day... or a denali truck awd...

 

just drove again for lunch, 300 miles on the truck, 23.5 mpgs, i can actually pull hills in V4 mode.

silverado1ss89- jeep srt8s are a ton of fun. mine was for sale but i couldnt part with it. sucker runs low 7s all day with some spray. hard to beat that.

 

Wow pull hills in V4 ........ can you elaborate on the afm tuning ?? ........do you think the gear swap also helps the truck stay in V4 ?


What cruise rpm to you get your best mileage at ? Towing with my old 5.3 truck it liked 2200 below that towing mileage fell off .trying to decide between 3.90's & 4.10's for my 2010 or tow in 5th withthe 3.42's