U.S. Department of Energy’s Clean Cities program has released its 2011 vehicle buyer’s guide. If you are in the market for a new vehicle, and are looking into alternative fuels, read this guide before hitting the dealerships. The Buyer’s Guide provides details on most alternative fuels, from natural gas, to electric, to fuel conversions on your current vehicle. It even lists the available models for each fuel type. To read the 2011 Vehicle Buyer’s Guide click here.