Fuel tank: 9 of 9 variants rated.
Opel Monza 2.5i tops the Opel Monza ranking by Fuel tank, at 70 L (18.5 gal US).
Across 9 ranked variants, Fuel tank spans from 70 L (18.5 gal US) to 70 L (18.5 gal US).
| # | Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|---|
| 1 | Opel Monza 2.5i | 1984 | Coupe | Petrol | 70 L (18.5 gal US) |
| 2 | Opel Monza 3.0i Sport | 1983 | Coupe | Petrol | 70 L (18.5 gal US) |
| 3 | Opel Monza 3.0i Comfort | 1983 | Coupe | Petrol | 70 L (18.5 gal US) |
| 4 | Opel Monza 3.0i GSi | 1983 | Coupe | Petrol | 70 L (18.5 gal US) |
| 5 | Opel Monza 2.5 E | 1981 | Coupe | Petrol | 70 L (18.5 gal US) |
| 6 | Opel Monza 2.5 E S | 1981 | Coupe | Petrol | 70 L (18.5 gal US) |
| 7 | Opel Monza 2.8 S | 1978 | Coupe | Petrol | 70 L (18.5 gal US) |
| 8 | Opel Monza 2.8 S S | 1978 | Coupe | Petrol | 70 L (18.5 gal US) |
| 9 | Opel Monza 3.0 E SC | 1978 | Coupe | Petrol | 70 L (18.5 gal US) |