X 2008 Mercury Grand Marquis FFV

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

EPA Fuel Economy

Regular Gasoline

Combined: 18 MPG

City: 15 MPG

Highway: 23 MPG

E85

Combined: 13 MPG

City: 11 MPG

Highway: 16 MPG

X 2008 Audi A4 Cabriolet quattro

3.1 L, 6 cyl, Auto (S6), Premium Gasoline

EPA Fuel Economy

Combined: 20 MPG

City: 17 MPG

Highway: 25 MPG