B16, B18, B20
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By poorman type-r
#308306 He got 13 mpg I think... If I remember correctly. It's detenation issues that you have to worry about when you are Daily driving a high compression motor.
By bks84
#308339 Like I said, run good fuel with a GOOD tune and youll be fine.

I'll know soon enough. I'll be running around with my 12.5:1 b20v, w/rocket cams, endyn head and itb's. ill be sure to report back.