2004 Honda Civic CNG MPG & Specs — Real Fuel Cost
Quick answer
The 2004 Honda Civic CNG gets an EPA-estimated 26/31 MPG (city/highway) and 28 MPG combined, with an estimated $1,600/year fuel cost and 251.071 g/mi CO₂. Engine: 1.7 L 4-cyl.
The 2004 Honda Civic CNG with the 1.7-liter 4-cylinder natural gas engine returns an EPA-estimated 26 MPG in the city and 31 MPG on the highway, for a combined 28 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 1.7 L 4-cyl |
| Transmission | Automatic (variable gear ratios) |
| Drive | Front-Wheel Drive |
| Fuel type | Natural Gas |
| Vehicle class | Compact Cars |
| MPG — city | 26 |
| MPG — highway | 31 |
| MPG — combined | 28 |
| Annual fuel cost* | $1,600 |
| CO₂ tailpipe | 251.071 g/mi |
| EPA GHG score | — |
How efficient is it?
With a combined 28 MPG, the 2004 Honda Civic CNG sits in the good range for fuel economy. That is about average for its class (Compact Cars, 25 MPG average).
Fuel economy and running costs
At about $1,600 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2004 Honda Civic CNG. Over five years that is roughly $8,000 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2004 Honda Civic CNG emits approximately 251.071 grams of CO₂ per mile at the tailpipe. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.