i get right around 350-370, I'm slightly modded and most of my miles are highway. I've got CAI, ZZP PCM, smaller pulley, and 3" exhaust from downpipe back.
I haven't maxed my car out since I've got this done. Haven't had the time to find a road straight enough to try it on. I've hit 135 a couple times though.
Is yours SC? If not I think I'm gonna be getting my PCM soon too.
My GT gets 25 miles a gallon.Mostly stop and go traffic.
in the newer prix you can use lower octane it just recomends 91 im at over 6000 feet so anything works