The 2010 Porsche Cayenne is available as a 4-door, 5-seat sport utility. Starting at $45,500, the 2010 Porsche Cayenne Base (M6) is powered by a 3.6L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2010PorscheCayenneS Transsyberia , priced at $ 70,800 , is powered by a 4.8L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 17-mpg on the highway.