If you’re still in the market for a hybrid or clean diesel, you should try to get one this holiday season, as most tax credits are going to expire on December 31, with no new tax breaks in sight for next year. Among the diesel models, the Mercedes ML350 BlueTec is one of the victims, while the natural gas-powered 2011 Honda Civic GX will also lose its $4,000 tax credit. The same goes for the recently introduced 2011 Hyundai Sonata Hybrid and 2011 Porsche Cayenne S Hybrid. Read more »