X 2009 BMW 550i

4.8 L, 8 cyl, Man 6-spd, Premium Gasoline

EPA Fuel Economy

Combined: 18 MPG

City: 15 MPG

Highway: 22 MPG

X 2004 Mercedes-Benz S55 AMG

5.4 L, 8 cyl, Auto (S5), Premium Gasoline

EPA Fuel Economy

Combined: 15 MPG

City: 13 MPG

Highway: 19 MPG