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CNG Vehicle Mileage Information

The driving range of a Honda Civic compressed natural gas (CNG) dedicated (CNG only) sedan with a full tank filled at 3,600 psi is 200 - 225 miles of freeway driving or 34 mpg.  The city/highway mileage is 30/34.  Most CNG stations fill at 3,600 psi (fuel-fill pressure) but if the vehicle is filled at 3,000 psi the range will decrease proportionately.  You can determine if the vehicle is filled at a lower psi, or not completely full, if the fuel gauge points to the lower full mark (the gauge has 2 full marks).  When the low fuel indicator turns on the driver will have at least 30 miles of fuel left.
 
The Chevy Cavalier bi-fuel sedan (CNG and gasoline) CNG sedan has 120 mile range at 3600 psi on the freeway from the CNG tank with an additional 350 miles on the gasoline tank.
 
Updated : 8/21/2007