BMW 3 Series 320i MPG: real-world figures (2019–2024)
The BMW 3 Series 320i returns 36 mpg in real-world UK driving, against an official WLTP figure of 44 mpg — a gap of 8.0 mpg.
Real-world MPG figures
- Real-world MPG: 36 mpg
- Official WLTP MPG: 44 mpg
- CO₂: 145 g/km
- Indicative annual fuel cost (10,000 mi @ 145p/L): £1,831
- Cost per mile (fuel only): 0.18p
At a typical 10,000 miles per year and current UK pump prices around 145p per litre, expect to spend roughly £1,831 on fuel — about 153 pounds a month.