X 2011 Cadillac STS AWD

3.6 L, 6 cyl, Auto (S6), Regular Gasoline

EPA Fuel Economy

Combined: 21 MPG

City: 18 MPG

Highway: 27 MPG

X 2010 Mercury Mariner Hybrid FWD

2.5 L, 4 cyl, Auto (variable gear ratios), Regular Gasoline

MSRP: $30,105

EPA Fuel Economy

Combined: 32 MPG

City: 34 MPG

Highway: 31 MPG