if I wanted a benz in the US for fuel economy and environment I would go with the 1987 190D 2.5 turbo stick shift, extremely rare car, but about 46 mpg easy.
Microbes eat diesel soot, so its all good there.
Diesel is a byproduct of making gasoline.
If I could get any mercedes Id get the new one like the C30 AMG or something like that, its the diesel. Next year in the C coupe.
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold