2015 Chevrolet Impala Bi-Fuel (CNG) MPG & Specs — Real Fuel Cost
Quick answer
The 2015 Chevrolet Impala Bi-Fuel (CNG) gets an EPA-estimated 17/25 MPG (city/highway) and 20 MPG combined, with an estimated $3,100/year fuel cost and 437 g/mi CO₂. Engine: 3.6 L 6-cyl.
The 2015 Chevrolet Impala Bi-Fuel (CNG) with the 3.6-liter 6-cylinder regular gasoline engine returns an EPA-estimated 17 MPG in the city and 25 MPG on the highway, for a combined 20 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 3.6 L 6-cyl |
| Transmission | Automatic (S6) |
| Drive | Front-Wheel Drive |
| Fuel type | Regular Gasoline |
| Vehicle class | Midsize Cars |
| MPG — city | 17 |
| MPG — highway | 25 |
| MPG — combined | 20 |
| Annual fuel cost* | $3,100 |
| CO₂ tailpipe | 437 g/mi |
| EPA GHG score | 5/10 |
How efficient is it?
With a combined 20 MPG, the 2015 Chevrolet Impala Bi-Fuel (CNG) sits in the moderate range for fuel economy. That is roughly 22% thirstier than the typical Midsize Cars of its era (26 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $3,100 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2015 Chevrolet Impala Bi-Fuel (CNG). Over five years that is roughly $15,500 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2015 Chevrolet Impala Bi-Fuel (CNG) emits approximately 437 grams of CO₂ per mile at the tailpipe, earning an EPA greenhouse-gas score of 5 out of 10. 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.