The 2010 Lincoln Navigator is available as a 4-door, 7-seat sport utility. Starting at $54,950, the 2010 Lincoln Navigator 4x2 is powered by a 5.4L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2010LincolnNavigator4x4 , priced at $ 57,850 , is powered by a 5.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated