PigRig

Hey guys, I was hoping to revive this thread - I just picked up a 24 Duramax, and am getting 11-11.5mpg consistently. Stop and go, highway, loaded or unloaded. 2,600 on the odometer so far. Reached out to Chevy in regards to the injector calibration and was told my VIN does not apply. I've got a buddy with a 22 who is getting 17-24 mpg on the same setup, though he has a stealth module installed. I really doubt the module would provide that kind of improvement. I'm open to any suggestions to get this pig chugging less fuel!