X 2009 Porsche Boxster S

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

EPA Fuel Economy

Combined: 22 MPG

City: 19 MPG

Highway: 26 MPG

X 2001 GMC Sierra 1500 2WD

5.3 L, 8 cyl, Auto 4-spd, Regular Gasoline

EPA Fuel Economy

Combined: 15 MPG

City: 14 MPG

Highway: 18 MPG