One thing I'd mention is that cars generally can increase their combined MPG by .5-1 mile for every 100 lbs dropped. If the average M3 comes in 200lbs less than an average 335i, and the tricks used to boost the power don't contribute to increased fuel consumption under low power conditions, perhaps we will see the M3 get better MPG than the 335i.
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1999 323i with 292K miles
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