The 2006 Lincoln Navigator is available as a 4-door, 7-seat sport utility. Starting at $52,255, the 2006 Lincoln Navigator Luxury (200A) 4x4 is powered by a 5.4L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2006LincolnNavigatorUltimate (120A) 4x2 , priced at $ 52,355 , is powered by a 5.4L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.