Every engine, transmission, drivetrain and fuel economy combination the EPA certified for the 2015 Civic. 7 configurations listed, with city, highway and combined mpg, annual fuel cost and tailpipe CO₂ for each one.
| Engine | Transmission | Drive | City | Hwy | Comb. | L/100km | Fuel cost/yr | CO₂ g/mi | Fuel |
|---|---|---|---|---|---|---|---|---|---|
| 2.4L I4 Start-stop | 6-speed manual | FWD | 22 | 31 | 25 | 9.4 | $3,300 | 352 | Premium Gasoline |
| 1.8L I4 CNG · Start-stop | 5-speed automatic | FWD | 27 | 38 | 31 | 7.6 | $1,500 | 218 | Natural Gas |
| 1.8L I4 Start-stop | 5-speed manual | FWD | 28 | 35 | 31 | 7.6 | $2,150 | 289 | Regular Gasoline |
| 1.8L I4 Start-stop | Automatic (variable gear ratios) | FWD | 29 | 37 | 33 | 7.1 | $2,050 | 272 | Regular Gasoline |
| 1.8L I4 Start-stop | Automatic (AV-S7) | FWD | 29 | 37 | 32 | 7.4 | $2,100 | 276 | Regular Gasoline |
| 1.8L I4 Start-stop | Automatic (variable gear ratios) | FWD | 31 | 40 | 34 | 6.9 | $1,950 | 259 | Regular Gasoline |
| 1.5L I4 Hybrid · Start-stop | Automatic (variable gear ratios) | FWD | 43 | 45 | 44 | 5.3 | $1,500 | 202 | Regular Gasoline |
mpg figures are the EPA window-sticker values in US gallons. The L/100km column is the same figure converted for metric readers. CO₂ is tailpipe only and excludes fuel production.
| Engine 1 | 1.5L I4 Hybrid (Regular Gasoline) |
|---|---|
| Engine 2 | 1.8L I4 (Regular Gasoline) |
| Engine 3 | 2.4L I4 (Premium Gasoline) |
| Engine 4 | 1.8L I4 CNG (Natural Gas) |
| Engine technology | HEV, RNG=193 |
|---|---|
| Start-stop | Engine idle-stop system fitted on at least one configuration |
| Electrification | CNG, Hybrid |
| Electric motor | 144V Li-Ion |
| Manufacturer config codes | HNX |
| Drivetrain | FWD |
|---|---|
| Vehicle class | Compact Cars |
| Fuel types | Natural Gas, Premium Gasoline, Regular Gasoline |
| Best combined | 44 mpg (5.3 L/100km) |
|---|---|
| Worst combined | 25 mpg (9.4 L/100km) |
| Spread | 25–44 mpg combined across configurations |
| Annual fuel cost (best) | $1,500 |
| Tailpipe CO₂ (best config) | 202 g/mile |
|---|---|
| Tailpipe CO₂ range | 202 – 352 g/mile across all configurations |
| EPA fuel economy score | 10 / 10 |
| EPA greenhouse gas score | 10 / 10 |
| 5-year fuel cost vs average new vehicle | $4,500 less |
Dimensions, curb weight, interior volume, oil capacity and torque specifications require official Honda documentation that we have not yet verified for this model year. They will be added once sourced.