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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.
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