Hey there, I have a 2004 Dodge SRT-4 in the fastest color made, PB5 of course! Anyway, it has some tasteful modifications for about 400hp via e85.
Mod List: Walbro, E1 Turbo, BFMIC, 3" TBE MPX w/ cat, solid MM + TM inserts, Duster 360 injector's and tunes, FM wastegate, and an aFe CAI, custom catchcan. That's it. On 93 at low elevations of New York State 100-400' typically I should be around 350whp gas / 400whp e85.
My blue beast now has 160,000 reliable miles on it and still ticking at about 26psi spike - 22psi hold.
I now live in Colorado, in the mountains to be exact around 8,000' elevation. I frequent elevations between 5,000-10,000' normally and have noticed the higher I go in elevation the better my fuel economy gets! At first, I expected the exact opposite, but then thought about it more. I guess the higher I go, the less oxygen the sensor detects which increases the PSI and decreases fuel to compensate. Then I thought this would cause detonation and horrible afr's... Well, my afr's are spot on, a bit messed up at WOT on the lean side but expected. The turbo screams bloody murder and I have backed PSI down twice now trying to adjust for the elevation.
Now, I don't go extremely fast anymore, but I do WOT almost every drive, every day at least once.
Now in Colorado or Utah or Wyoming, I get 38mpg HWY!!! In colorado alone, where I drive from the mountains 8,000' down a winding canyon to 5,000' to school and back up daily, I average 32 MPG!!!
Does anyone else out there get even close to these results???