X 2009 Infiniti G37x

3.7 L, 6 cyl, Auto (S7), Premium Gasoline

EPA Fuel Economy

Combined: 20 MPG

City: 18 MPG

Highway: 25 MPG

X 2003 Porsche Boxster S

3.2 L, 6 cyl, Auto (S5), Premium Gasoline

EPA Fuel Economy

Combined: 18 MPG

City: 15 MPG

Highway: 24 MPG