So I figured I'd throw my fuel consumption in here as well on my '13 28i (mind you it's in metric, so you'd have to do the conversion). Had the car for exactly a year at this point so you can see fluctuations season to season.
Main impact on the fuel consumption I've found to be the speed. It's very efficient at 60mph, a little worse going up to 80mph, and pretty terrible above 80 mph.
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