Calculated, or based on the computer? I find the average fuel economy calculated by the computer to be 1 mpg high. Our 1999 328i was 2 mpg high, every time. That being said, after the exhaust work, I can get 24 mpg highway. I haven't done a decent trip after I put the CAI on to see if it helped any.

I'm actually shocked at how low some are getting with the 3.0. Even when I drive mine pretty hard I still get 17 in town. My wife gets 19 with her driving style. Of course "city" varies depending on where you live. What do you get in town?

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2004 X5 3.0 MT, custom exhaust, AFE intake, Shark Injector, Towing Package, 100K miles

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