X 2010 Porsche Cayman

2.9 L, 6 cyl, Auto 7-spd, Premium Gasoline

MSRP: $51,400

EPA Fuel Economy

Combined: 24 MPG

City: 20 MPG

Highway: 29 MPG

X 2002 Dodge Ram Van 2500 2WD CNG

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

EPA Fuel Economy

Combined: 13 MPG

City: 12 MPG

Highway: 14 MPG