fueleconomy.gov, the government's official site for fuel economy information, has just released the new fuel economy estimates for 2012 model year vehicles.
Fueleconomy.gov's Top Ten EPA-Rated Fuel Sippers (2012)

For more information please visit here: http://www.fueleconomy.gov/feg/topten.jsp
*Vehicles are ranked by their combined rating (weighted by 55% city and 45% highway), then by their city rating. In the event of a tie, multiple vehicles may share the same ranking.