I just started tuning this 6.2 (07 Yukon Denali) & trying to get some better MPG out of it and a little extra performance. i set it up to run MAF full time after i put the CAI on and it seems to run better and the power is smoother.

as the title says, do i really need this able to pull that much timing? i compared the high and low octane tables and at most there is 10* difference between the two. i backed the max down to 15 for now, any reason i shouldnt, or maybe take it down to 10? i normally run regular fuel around town, but if im going on a long highway trip premium seems to be worth the cost in the end, so im not sure if i should mess too much with the high octane spark table??

also any tips for pulling some MPG out of this thing would be appreciated. its stock except for the CAI, but i plan to delete the CATs and see if theres room to do a true dual exhaust.