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My 128i is a 6 speed manual and is driven mostly on the highway or back roads - averaging 27.5 mpg overall (using primarily 93 octane). Maybe you can try cruising a few hundred miles at 65~70 mph - I've managed 32.5 mpg under those conditions, with no A/C & no headwind. As my worst is 22.5 in city/suburban driving, your 19.9 doesn't sound too bad. However, are you resetting the OBC after each fill-up and double-checking the fuel economy by calculating actual miles traveled divided by gallons used? I discovered that while my OBC is pretty accurate, my odometer is about 1 1/2% slow, so my gas mileage is a bit better than I initially thought. Also, even though "break-in" is supposed to be 1,200 miles, my mileage didn't start really improving until about double that.
Tom
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