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Well.. your thread title question doesn't really match up with what you actually posted. I'll address both scenarios. If your buddy is hating life with that kind of mileage and isn't really a car guy...then he should buy the most fuel efficient ride out there and not dick around with turboed cars or anything like that.
As far as what I'm doing as the owner of a turboed car to save gas... I stay out of boost as much as humanly possible. That netted me about a 2 mpg improvement. Then, I decided to push my afr's out a bit, running a slightly modifed map on my ecu made by me, so my low load / rpm driving runs about 15.1 :1 AFR's...out of boost. That netted me about 2 mpg more than what I was getting. I was averaging 16mpg when I didn't care.... now i'm getting about 20mpg. Still not great...
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2002 WRX "Fun-Wagon"
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