In 1997, MB introduced electronic fuel injection to diesel passenger car engines with the C 220 CDI.

FORBES: 2012 Mercedes-Benz GL 350 BlueTEC Test Drive and Review: A Hug for Diesel

Honda announced in June that, by 2009, it will market an all-new hybrid vehicle, the company's fourth, and offer a clean diesel passenger car that will likely get 45 miles to the gallon.

FORBES: Magazine Article

Mercedes-Benz has a long history with diesel engines, dating back to 1936 and the first production diesel-powered passenger car, the 260 D.

FORBES: 2012 Mercedes-Benz GL 350 BlueTEC Test Drive and Review: A Hug for Diesel