Fuel tank: 8 of 8 variants rated.
Opel Commodore Voyage 2.5 E De Luxe tops the Opel Commodore ranking by Fuel tank, at 70 L (18.5 gal US).
Across 8 ranked variants, Fuel tank spans from 65 L (17.2 gal US) to 70 L (18.5 gal US).
| # | Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|---|
| 1 | Opel Commodore Voyage 2.5 E De Luxe | 1981 | Wagon | Petrol | 70 L (18.5 gal US) |
| 2 | Opel Commodore Voyage 2.5 E Berlina | 1981 | Wagon | Petrol | 70 L (18.5 gal US) |
| 3 | Opel Commodore Voyage 2.5 S De Luxe | 1979 | Wagon | Petrol | 70 L (18.5 gal US) |
| 4 | Opel Commodore Voyage 2.5 S Berlina | 1979 | Wagon | Petrol | 70 L (18.5 gal US) |
| 5 | Opel Commodore 2.5 E De Luxe | 1981 | Sedan | Petrol | 65 L (17.2 gal US) |
| 6 | Opel Commodore 2.5 E Berlina | 1981 | Sedan | Petrol | 65 L (17.2 gal US) |
| 7 | Opel Commodore 2.5 S De Luxe | 1979 | Sedan | Petrol | 65 L (17.2 gal US) |
| 8 | Opel Commodore 2.5 S Berlina | 1979 | Sedan | Petrol | 65 L (17.2 gal US) |