The 2008 Lincoln Navigator is available as a 4-door, 7-seat sport utility. Starting at $48,745, the 2008 Lincoln Navigator 4x2 is powered by a 5.4L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 18-mpg on the highway. The top of the line 2008LincolnNavigator4x4 , priced at $ 51,645 , is powered by a 5.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated