X 2005 Ford Thunderbird

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

EPA Fuel Economy

Combined: 18 MPG

City: 16 MPG

Highway: 22 MPG

X 2010 GMC Sierra K15 4WD

4.8 L, 8 cyl, Auto 4-spd, Regular Gasoline or E85

MSRP: $24,090 - $42,275

EPA Fuel Economy

Regular Gasoline

Combined: 15 MPG

City: 13 MPG

Highway: 18 MPG

E85

Combined: 11 MPG

City: 10 MPG

Highway: 13 MPG