X 2007 Porsche Carrera 4 S Cabriolet

3.8 L, 6 cyl, Man 6-spd, Premium Gasoline

EPA Fuel Economy

Combined: 18 MPG

City: 16 MPG

Highway: 23 MPG

X 2012 GMC Yukon XL 1500 AWD

6.2 L, 8 cyl, Auto 6-spd, Regular Gasoline or E85

MSRP: $46,345 - $50,525

EPA Fuel Economy

Regular Gasoline

Combined: 14 MPG

City: 13 MPG

Highway: 18 MPG

E85

Combined: 10 MPG

City: 9 MPG

Highway: 13 MPG