X 1991 Rolls-Royce Continental

6.8 L, 8 cyl, Auto 3-spd, Premium Gasoline

EPA Fuel Economy

Combined: 10 MPG

City: 9 MPG

Highway: 12 MPG

X 1997 Ford Crown Victoria CNG

4.6 L, 8 cyl, Auto 4-spd, Natural Gas

EPA Fuel Economy

Combined: 18 MPG

City: 15 MPG

Highway: 23 MPG