After dipping its toes into the plug-in hybrid waters, Mercedes-Benz is ready to jump in with both feet. The automaker is planning to launch 10 new plug-in hybrid models between now and 2017 -- on average, that's a new green machine every four months. The only two confirmed US models so far are the 2016 C350e (above) and S550e, both of which arrive this fall, but Mercedes is promising that vehicles from the C-Class on up (including the GLE-Class SUV) will get the semi-electric treatment. Between these and pure EVs like the B-Class Electric Drive, you may not have to compromise on model selection just because you want an eco-friendly ride with a tri-star badge.