Infiniti Q50 vs Mazda 3
The Mazda 3 is the more efficient of the two: it reaches 33 mpg combined versus 31 mpg for the Infiniti Q50, a 2 mpg advantage and costs about $600 less per year to fuel.
Across 5 measured categories, the Mazda 3 leads in 5. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | Infiniti Q50 | Mazda 3 |
|---|---|---|
| Best combined MPG | 31 mpg | 33 mpg ✓ |
| Best city MPG | 29 mpg | 30 mpg ✓ |
| Best highway MPG | 36 mpg | 40 mpg ✓ |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,450 | $1,850 ✓ |
| Lowest CO2 output | 286 g/mi | 266 g/mi ✓ |
| Engines offered | SIDI, 3.5, 2.0, 3.7 | SIDI, SIDI; With Cylinder Deactivation, SIDI; Without Cylinder Deactivation, SIDI; with i-ELOOP Technology Package |
| Transmissions | Automatic (S7) | Automatic (S6), Manual 6-spd |
| Drivetrains | All-Wheel Drive, Rear-Wheel Drive | 4-Wheel Drive, Front-Wheel Drive |
| Fuel types | Premium | Regular |
| EPA class | Midsize Cars | Midsize Cars |
| Years covered | 2015–2024 | 2015–2026 |
| Configurations on record | 60 | 97 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
Q50 vs 3: common questions
Which is better on gas, the Infiniti Q50 or the Mazda 3?
The Mazda 3 is the more efficient of the two: it reaches 33 mpg combined versus 31 mpg for the Infiniti Q50, a 2 mpg advantage and costs about $600 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Mazda 3 runs about $1,850 a year in fuel at its most efficient configuration, versus about $2,450 for the Infiniti Q50 — a difference of roughly $600 per year.
What engines do the Q50 and 3 offer?
Infiniti Q50: SIDI, 3.5, 2.0, 3.7. Mazda 3: SIDI, SIDI; With Cylinder Deactivation, SIDI; Without Cylinder Deactivation, SIDI; with i-ELOOP Technology Package.
Are they in the same vehicle class?
Yes — the EPA classifies both the Infiniti Q50 and the Mazda 3 as Midsize Cars, so they compete directly.
More Q50 comparisons
Comparison id: infiniti-q50-vs-mazda-3