The 2006 Porsche Cayenne is available as a 4-door, 5-seat sport utility. Starting at $45,200, the 2006 Porsche Cayenne Base is powered by a 3.2L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 19-mpg on the highway. The top of the line 2006PorscheCayenneBase (M6) , priced at $ 42,200 , is powered by a 3.2L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.