BMW 4 Series vs Infiniti Q50
The BMW 4 Series and Infiniti Q50 are evenly matched on fuel economy — both peak at 31 mpg combined — so the decision comes down to engine choice, drivetrain, and class.
Across 2 measured categories, the BMW 4 Series leads in 1. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | BMW 4 Series | Infiniti Q50 |
|---|---|---|
| Best combined MPG | 31 mpg | 31 mpg |
| Best city MPG | 28 mpg | 29 mpg ✓ |
| Best highway MPG | 36 mpg | 36 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,450 | $2,450 |
| Lowest CO2 output | 285 g/mi ✓ | 286 g/mi |
| Engines offered | SIDI & PFI; Mild Hybrid, SIDI, SIDI; Mild Hybrid, SIDI S | SIDI, 3.5, 2.0, 3.7 |
| Transmissions | Automatic (S8), Manual 6-spd | Automatic (S7) |
| Drivetrains | Rear-Wheel Drive, All-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Premium | Premium |
| EPA class | Compact Cars | Midsize Cars |
| Years covered | 2015–2027 | 2015–2024 |
| Configurations on record | 160 | 60 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
4 Series vs Q50: common questions
Which is better on gas, the BMW 4 Series or the Infiniti Q50?
The BMW 4 Series and Infiniti Q50 are evenly matched on fuel economy — both peak at 31 mpg combined — so the decision comes down to engine choice, drivetrain, and class.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Infiniti Q50 runs about $2,450 a year in fuel at its most efficient configuration, versus about $2,450 for the BMW 4 Series — a difference of roughly $0 per year.
What engines do the 4 Series and Q50 offer?
BMW 4 Series: SIDI & PFI; Mild Hybrid, SIDI, SIDI; Mild Hybrid, SIDI S. Infiniti Q50: SIDI, 3.5, 2.0, 3.7.
Are they in the same vehicle class?
The EPA classifies the BMW 4 Series as Compact Cars and the Infiniti Q50 as Midsize Cars, so they aren't a like-for-like match on size.
More 4 Series comparisons
Comparison id: bmw-4-series-vs-infiniti-q50