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imo, fuel consumption really hinges on the driver's behaviors.
you could give two people the same cars and same commute patterns, but get differences of 30% easily.
fwiw, since owning my 335xi i've averaged 28.5 mpg, which is higher than i was expecting. i do punch it from time to time, but spend a fair bit of time in eco mode too, esp when driving to work.
if i drove it like a raped ape all the time in sport mode, i would easily be in the low 20s.
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