2018 Mazda 3 5-Door MPG & Specs — Real-World vs EPA, All Trims
Every trim takes regular — no premium needed.
Is the 2018 Mazda 3 5-Door good on gas?
At up to 32 MPG combined, the 2018 Mazda 3 5-Door is better than average for a Midsize Cars — that class averages about 23.0 MPG across 5,710 EPA-tested versions, so it's a good pick on fuel for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $3.80/gal for regular gas as of 2026-07-05 — the most efficient trim runs about $1,781/year (roughly $148/month, about $11.88 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 469 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2018 Mazda 3 5-Door trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 2.0L 4-cyl, S6 automatic, FWD | REGULAR | 32 | $1,781 |
| 2.0L 4-cyl, 6-spd manual, FWD | REGULAR | 31 | $1,839 |
| 2.5L 4-cyl, S6 automatic, FWD | REGULAR | 30 | $1,900 |
| 2.5L 4-cyl, 6-spd manual, FWD | REGULAR | 28 | $2,036 |
2018 Mazda 3 5-Door specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 2.0L 4-cyl · 2.5L 4-cyl |
| Transmission | S6 automatic · 6-spd manual |
| Drive type | FWD |
| EPA body class | Midsize Cars |
| Fuel | Regular |
| Tailpipe CO₂ | 280–319 g/mi |
Other years of the Mazda 3 5-Door
Similar cars (Midsize Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
4 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.