The 2012 Jeep Liberty is available as a 4-door, 5-seat sport utility. Starting at $23,395, the 2012 Jeep Liberty Sport 4x2 is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway. The top of the line 2012JeepLibertyLimited Jet Edition 4x4 , priced at $ 28,995 , is powered by a 3.7L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.