The mileage the m3 is getting is atrocious. It makes a hemi, with it's size and mass, look like a green engine. The 530 hp and 505 lb ft of torque Gt2 is apparently efficient enough to avoid the gas guzzler tax altogether. "Efficient dynamics" should be changed to very inefficient dynamics.
The fact that BMW wastes millions on R&D by producing a car that has what seems like an infinite number of gimmicky driver settings and at the same time they produce a light, state of the art, compact ,4 litre engine that when babied can't get 20 mpg on the highway, coasting down hill with a tail wind, is in itself a stunning achievement.