The R350 Bluetec uses the same 210-hp 3.0-liter V6 turbodiesel as the GL350 Bluetec.

FORBES: 2012 Mercedes-Benz R350 Bluetec 4Matic

The E350 Bluetec has a 210-hp 3.0-liter V6 turbodiesel that gets an EPA-estimated 21 mpg city, 32 mpg highway and 25 mpg combined.

FORBES: 2012 Mercedes-Benz E350 Bluetec

Remember the Ferrari Enzo (2002-04), 651 hp, 3, 200 pounds, skeletal in carbon fiber, pushrod suspension, F1-derived V12 mounted amidships?

WSJ: 2012 Ferrari F12 Berlinetta Review: Tech That Makes Drivers Into Gods | Rumble Seat by Dan Neil