adam8076

as of right now ive done LT,s volant cai , no cats, slp lm2 and reversed glass pack, 4.10s it is 4x4 btw

my question is i get 11-12mpg city and at 55 i get 18 65 14.5mpg and at 70 14mpg im in corpus Texas and the winds have been bad at least when i last test the mpgs

What does every think is this thing any more thirsty than others dont get me wrong im VERY impressed with the performance of this pig n i love it which is y im curious if there is something i can do to improve or correct let me know

also it has been tuned by Justin at Black bear which was nice and ez but would i benefit from taking it to nelsons im 2 hrs away

Let me know how your project/build/and or truck proforms too
Thanks for the help guys

AKlowriderZ71

iTrader: (22)

How big are your tires?

adam8076

oh yeah forgot to mention 285/70-17 duratraxs yes i know heavy *****RS
i believe thats 31.5'' coverted

ForkHorn

285/70/17 is closer to 33". FWIW I'm running the same size tire on my 2010 5.3 6l80e RCSB 4x4 also. No performance modifications yet. Gears are stock 3.42. I average 16 ish mpg with a lot of highway driving.

I am saving up for 4.11s and a tune though.

I would expect better mpg from your mods. I hope you can figure it out man

adam8076

yeah me to thanks for the respone . If i remember correctly no bs i gained 1.5 mpg just ditching the stock exhaust and i wanna say i gained maybe 1 from the cai but after that it went to hell with the headers n tune

Oh u will love those 4.10s best mod for me yet WORLD of difference

ForkHorn

That's great to hear about the gears! It seems like the best bang for the buck.

I wonder if your tune is still a little unrefined? There could be some small changes that would make a world of difference. The setup is pretty unique compared to other 5.3 trucks. You are the first 5.3/6l80e RCSB 4x4 on bigger tires other than mine that I have heard about.

Not a knock against Justin or blackbear. They do great work. Just that your setup is a lot different. It might need extra attention. Maybe someone else with more experience has a different (better) opinion.

But it seems most mileage stuff on these trucks is in the tune and our right foot

NKPPhil

Speed makes a big difference on my truck also - from about 18.5 mpg if I keep it below 60 to low 14s at 80-ish. Some of that is probably my 33" tires, some of it is my 2.25" front x 1" rear leveling kit. GM invests millions in aerodynamics and I throw it all out the window. Oh well ....

You might try going back to Justin for a tune adjustment. If you got an Autocal tune just send him another log file and ask him to check it out.

adam8076

i may try asking him again.
Can anyone chime in on doing a dyno tune vs autocal i dont know how detailed that tuning method is
Thanks