Useless for me

[Sailman_29]

I bought my inTune for economy.

With MPG Booster tune, my consommation increased by 0.5 MPG.
With 87 octane tune, my consommation increased by 1 MPG.

This is my Pick-up:
2007 Silverado 2500HD
Rear axle ratio is GT5 = 4.10
6 speeds, gas
With big commercial truck caps (7 feet high)
Always loaded with around 3000 to 3500 pounds.

After testing it for 2 months, I took it back to stock tune.

Is there something I can do?

[Mike_Levy]

You have a 6,000+lb truck, with 4.10 gears, big ass caps, and always loaded. Nothing is going to help your economy. The only way to even get decent economy loaded like that would be to get a diesel.

[BlackZ71Silverado]

Did you get your LTFT dialed in? That will make a difference.
Really not much fuel economy we can get out of these trucks, especially a loaded HD.

[Ill_Born_SS]

Yeah fuel economy for that kind of use would be minimum. Do you run in tow/haul mode 100% of the time? You should much easier on the truck with that weight.
You could try dialing it in http://diablosport.com/index.php?name=P ... opic&t=917
or get a custom tune (info is in the link also) but you may not see much.
When was your last tune up (plugs, wires clean the induction system)
What kind of gas you using and miles on the truck?

[Sailman_29]

Thanks guys. I will try to log data and view the results.

My truck is 40 000 miles and I run it in 87 octanes.

[Sailman_29]

Maybe the TCM support could help me to set it somewhere between tow/haul mode and regular mode.