My MPG went up since installing RR intake and DP's. I too have the JB3 and it really all depends on your driving style. I'm pretty conservative so I get pretty decent MPG.
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BMW 135i/6 Speed/ Montego Blue/Formula One Ceramic Tint/JB4 G4/AA Sport Intercooler/19 inch Iconz 880Z(19X8.5 & 19X10)/PSS 225/35 & 265/30/E93 M3 front sway bar/TRW front and rear Control Arms/BMS Drop In Filter/Dinan Exhaust/BlackLines/Upgraded \\\M RSFB
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