BMW 3 Series 320i vs BMW 3 Series 320d: real MPG, tax and cost per mile
Side-by-side UK comparison of the BMW 3 Series 320i and BMW 3 Series 320d on the metrics that actually drive ownership cost: real-world efficiency, road tax (VED), insurance group and depreciation outlook.
Comparison table
| BMW 3 Series 320i | BMW 3 Series 320d | |
|---|---|---|
| Fuel type | petrol | diesel |
| Body style | saloon | saloon |
| Years | 2019–2024 | 2019–2024 |
| Real-world efficiency | 36 mpg | 49 mpg |
| Official efficiency | 44 mpg | 60 mpg |
| CO₂ (g/km) | 145 | 124 |
| Road tax year one | £680 | £680 |
| Road tax standard | £195/yr | £195/yr |
| Insurance group | 28/50 | 30/50 |
| Depreciation | average | average |