The 2005 Porsche Cayenne is available as a 4-door, 5-seat sport utility. Starting at $41,100, the 2005 Porsche Cayenne Base (M6) is powered by a 3.2L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 20-mpg on the highway. The top of the line 2005PorscheCayenneTurbo (A6) , priced at $ 89,300 , is powered by a 4.5L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.