Have you looked into injectors that have a better fuel spray atomization I was looking into 12 hole injector just to see if there was any difference in overall performance. But that will have wait since my AP stroker is still in the garage. The injectors that are currently in are from GC wasn't sure if was from the 4.7 or 5.7 none the less it woke up the stroker nicely when starting it up, as for the mpg around town 15-17 with ax15, 3.07 gears and 235/15 AT tires and on the HW it was much better low 20's . Have you consider switching to ax15 or the nv3550 just a thought