Well curiously, for MY 2009 the BMW USA owner's manual PDF lists the capacity of a 328i coupe as 16.1 gallons, including reserve of 2.1 gallons, and an E92 M3 as 16.6 gallons, including reserve of 3.3 gallons.
Originally Posted by rdollie
Also, at about 16.6 gallons (from memory) I believe the M3's gas tank is smaller than other 3 series cars so miles per tank isn't quite apples to apples but you can count on lower MPG and higher S(miles)PG!
I was kind of surprised, but at least for these two examples the M3 has a LARGER tank.
I would have said they were the same size before I looked.
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Last edited by MMME30W; 11-18-2012 at 05:51 PM.