When I got the truck back, I immediately installed a PPE tune.
I've been averaging 13-15mpg in mixed driving. That's not babying it but it's not beating the crap out of it neither...
I sold the PPE and installed a Diablo T1000 Trinity tuner.
It only adds about 120HP and 240 ft. lbs of torque to the existing 300/520
Granted, it's only been two days but I've driven it enough to know what it's been doing.
Here's what I'm averaging the last two days... still running 75 on the highway and driving normal around town. (50/50 mix)
I'm having to send the Diablo back because I can't adjust for gears or tire size but hopefully the new tuner will get me the same results.
Mark