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2011 GMC 4x4 5.3L Crew Cab Only Mods are Nitto Trail Grapplers 295/70 17s and 2inch leveling kit.
Just trying to get a little more performance out of the truck when I need it but biggest thing is trying to get better mpg. Right now Im only getting 12.5 driving it nice. Went out and did a few short WOT runs for log.
No GM truck gurus out there that can take a look at my logs?
Spark is generally best bet for better MPG's. Start logging output torque and bumping timing up or down while part throttle cruising. Log it vs. RPM and cyl airmass. It'll take a lot of driving and experimenting, unless you have a dyno and can set the load and start bumping it around. You also need to do some research on leaning out your PE. 12.5 is ideal for NA vehicles. Getting rid of BK is a great performance bump, as long as you don't have real KR in the large air transitions. If you're in a state that doesn't require emissions like mine (WY), shut off any of the cat protection crap and that'll help with MPG's.