X 2003 Honda Civic CNG

1.7 L, 4 cyl, Auto (variable gear ratios), Natural Gas

EPA Fuel Economy

Combined: 28 MPG

City: 26 MPG

Highway: 31 MPG

X 2007 Volkswagen Passat 4motion

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

EPA Fuel Economy

Combined: 19 MPG

City: 16 MPG

Highway: 24 MPG