I've got the C&L Intake, DiabloSport C&L 91 octane tune with -2 GS (so I can run 89 octane), and drive 25 miles each way to work, some city, some highway, and I'm averaging 20.8 miles per gallon. Not bad, and I do get on it once in a while. :)
Jay
'05 Sonic Blue GT Premium