2015 head-to-head · Compact Car
2015 Honda Civic CNG vs Mazda 3
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
FWD · 1.8L 4-cyl · 5-speed automatic · 31 MPGe
On fuel costs these two are nearly tied. Driving 15,000 miles a year with $2.90/gge natural gas and $3.10/gal regular gas, the most efficient 2015 Honda Civic CNG (31 MPGe) costs about $1,403 a year to fuel and the 2015 Mazda 3 (33 MPG) about $1,409.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Honda Civic CNG
- Mazda 3
Side by side
| Honda Civic CNG | Mazda 3 | |
|---|---|---|
| $1,403 | Your annual fuel cost | $1,409 |
| 31 MPGe | Combined efficiency | 33 MPG |
| 27 MPGe | City | 29 MPG |
| 38 MPGe | Highway | 39 MPG |
| 95 cu ft | Passenger volume | 96 cu ft |
| 6 cu ft | Cargo volume | 12 cu ft |
| 218 g/mi | Tailpipe CO₂ (g/mi) | 270 g/mi |
| 8/10 | EPA fuel economy score | 8/10 |
| 9/10 | EPA greenhouse gas score | 8/10 |
| Natural gas | Powertrain | Gas |
| Natural gas (CNG) | Fuel | Regular gasoline |
| 1.8L 4-cyl | Engine / motor | 2.0L 4-cyl |
| 5-speed automatic | Transmission | 6-speed manual |
| FWD | Drivetrain | FWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Honda Civic CNG vs Mazda 3 across model years
- Honda Civic CNG
- Mazda 3
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Per EPA interior volume figures, the Mazda 3 has more cargo space (12 vs. 6 cu ft).
Among 52 2015 compact cars, the Honda Civic CNG ranks 12th and the Mazda 3 13th for lowest fuel cost.
The powertrains differ: the Honda Civic CNG is a natural-gas vehicle, while the Mazda 3 is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2015 Honda Civic CNG or the 2015 Mazda 3?
Measured by cost to drive, the Honda Civic CNG. The Honda Civic CNG is rated 31 MPGe combined and the Mazda 3 33 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Honda Civic CNG vs. the Mazda 3 per year?
At 15,000 miles a year with $2.90/gge natural gas and $3.10/gal regular gas, about $1,403 for the Honda Civic CNG and $1,409 for the Mazda 3.
Which has more cargo space?
The Mazda 3, with 12 cu ft of luggage volume versus 6 cu ft (EPA interior volume index).
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