That's exactly why I passed on the M3 and purchased the 335d which for everyday city driving is the ultimate car:
"On the dyno, we found out why the BMW felt so fast. Rated at 265 hp and 425 lb-ft at the crank, the little 3.0L inline-six in the 335d actually made 258 hp and 421 lb-ft at the wheels, making the crankshaft numbers closer to 300 hp and 525 lb-ft."
http://www.dieselpowermag.com/featur...el_engine.html
The 36 MPG average that I'm getting is a bonus.