Mercedes-Benz has confirmed what we've been hoping to hear: the S400 hybrid won't remain the only fuel efficient vehicle of the S-Class family. The S350 Bluetect will be coming to the U.S. market for 2011 as the first diesel S-Class since the mid-90s. The S350 will use the same 3.5-liter turbodiesel V6 used in the ML, GL, and R-Class SUVs. The S350 will be able to at least match the 22 mpg results achieved with the S400 gas-electric earlier this year.