Vehicle comparison
Honda Civic vs Mazda Mazda3
Side-by-side fuel and ownership cost comparison. Estimates use 12,000 mi/year at average US gas prices.
- Updated for 2026
- EPA-style MPG
- US avg fuel prices
- US units
- Transparent assumptions
Lowest running cost
Honda Civic wins on fuel cost
At 12,000 miles per year, the Honda Civic costs about $1150 per year, roughly $185 less than the Mazda Mazda3. Over 5 years, that's about $927 in fuel savings.
Spec & cost comparison
MPG/MPGe figures are estimates based on typical recent model years.
| Spec | Honda Civic | Mazda Mazda3 |
|---|---|---|
| Type | SEDAN | SEDAN |
| Fuel | Regular gas | Regular gas |
| City MPG/MPGe | 33 | 28 |
| Highway MPG/MPGe | 42 | 36 |
| Combined MPG/MPGe | 36 | 31 |
| Tank / Battery | 12.4 gal | 13.2 gal |
| Energy cost | $3.45/gal | $3.45/gal |
| Cost per mile | $0.096 | $0.111 |
Annual cost at 8k / 12k / 15k miles
Estimated yearly fuel spend at common US mileage levels.
| Miles/year | Honda Civic | Mazda Mazda3 | Difference |
|---|---|---|---|
| 8,000 | $767/yr · $64/mo | $890/yr · $74/mo | $124 (Honda Civic) |
| 12,000 | $1150/yr · $96/mo | $1335/yr · $111/mo | $185 (Honda Civic) |
| 15,000 | $1438/yr · $120/mo | $1669/yr · $139/mo | $232 (Honda Civic) |
Estimates only. Real costs depend on driving style, terrain, local gas/electricity prices and weather.
Which one is best for…
Best for commuting
Honda Civic
Highest combined MPG/MPGe and lowest cost per mile means cheaper daily driving.
See Honda CivicBest for road trips
Honda Civic
Better highway efficiency, larger tank/battery and longer range between stops.
See Honda CivicBest for families
Honda Civic
SUVs, minivans and three-row vehicles win on space and child-seat flexibility.
See Honda CivicBest for lowest running cost
Honda Civic
Cheaper energy use and lower cost per mile at every common mileage tier.
See Honda CivicHow we compare these vehicles
- Annual mileage
- Modeled at 12,000 mi/yr unless a scenario specifies otherwise.
- Cost per mile
- $/gal ÷ MPG, or $/kWh ÷ (MPGe ÷ 33.7) for EVs.
- EV vs gas
- Compared at average US gas and residential electricity prices — fast-charging can be 2–3× higher.
- Maintenance
- Fuel cost only — EVs typically save another $400–$1,000/yr in service and brake wear.
Sources & assumptions
- EPA fuel economy data — City / highway / combined MPG and MPGe baselines.
- U.S. Department of Energy (fueleconomy.gov) — Vehicle efficiency and EV range references.
- AAA gas price trends — Recent national and regional retail fuel averages.
- EIA electricity rates — Average residential per-kWh prices used for EV charging.
We summarize publicly available data — no scraping, no external API calls. Figures are calibrated periodically; use the calculators above for your exact inputs.
Frequently asked questions
Which is cheaper to drive, the Honda Civic or Mazda Mazda3?
At 12,000 miles per year, the Honda Civic costs about $1150 per year vs $1335 for the Mazda Mazda3 — roughly $185 less per year.
What's the MPG difference between the Honda Civic and Mazda Mazda3?
The Honda Civic is rated around 36 combined MPG versus 31 MPG for the Mazda Mazda3. Highway figures are 42 vs 36.
How much will I spend on fuel over 5 years?
Driving 12,000 miles a year for five years, expect about $5750 for the Honda Civic and $6677 for the Mazda Mazda3, a difference of roughly $927.
Is the Honda Civic or Mazda Mazda3 better for commuting?
For pure cost per mile, the Honda Civic wins. EVs charged at home typically deliver the lowest commuting cost, followed by hybrids and efficient compacts.
Which one is better for road trips?
Honda Civic is generally the better road-trip choice — gas and hybrid vehicles win on long highway routes thanks to faster refueling, while EVs work best when charging stops fit your route.
Are these fuel cost numbers accurate for my driving?
They're estimates based on EPA-style combined MPG and average US gas prices. Real-world cost depends on local fuel prices, driving style, terrain, weather and how much city vs highway driving you do.