Fuel tank: 16 of 16 variants rated.
BMW 630i Gran Turismo tops the BMW 6-Series GT ranking by Fuel tank, at 68 L (18.0 gal US).
Across 16 ranked variants, Fuel tank spans from 66 L (17.4 gal US) to 68 L (18.0 gal US).
| # | Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|---|
| 1 | BMW 630i Gran Turismo | 2020 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 2 | BMW 640i Gran Turismo | 2020 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 3 | BMW 640i xDrive Gran Turismo | 2020 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 4 | BMW 630i Gran Turismo | 2017 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 5 | BMW 640i Gran Turismo | 2017 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 6 | BMW 640i xDrive Gran Turismo | 2017 | Hatchback | Petrol | 68 L (18.0 gal US) |
| 7 | BMW 620d Gran Turismo | 2020 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 8 | BMW 620d xDrive Gran Turismo | 2020 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 9 | BMW 630d Gran Turismo | 2020 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 10 | BMW 630d xDrive Gran Turismo | 2020 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 11 | BMW 640d xDrive Gran Turismo | 2020 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 12 | BMW 620d Gran Turismo | 2018 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 13 | BMW 620d xDrive Gran Turismo | 2018 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 14 | BMW 630d Gran Turismo | 2017 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 15 | BMW 630d xDrive Gran Turismo | 2017 | Hatchback | Diesel | 66 L (17.4 gal US) |
| 16 | BMW 640d xDrive Gran Turismo | 2017 | Hatchback | Diesel | 66 L (17.4 gal US) |