Fuel tank: 8 of 8 variants rated.
Audi 90 2.3 E 20V Quattro tops the Audi 90 ranking by Fuel tank, at 70 L (18.5 gal US).
Across 8 ranked variants, Fuel tank spans from 68 L (18.0 gal US) to 70 L (18.5 gal US).
| # | Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|---|
| 1 | Audi 90 2.3 E 20V Quattro | 1989 | Sedan | Petrol | 70 L (18.5 gal US) |
| 2 | Audi 90 2.3 E Quattro | 1987 | Sedan | Petrol | 70 L (18.5 gal US) |
| 3 | Audi 90 2.2 Quattro | 1984 | Sedan | Petrol | 70 L (18.5 gal US) |
| 4 | Audi 90 2.3 E 20V+1 | 1990 | Sedan | Petrol | 68 L (18.0 gal US) |
| 5 | Audi 90 2.0 E | 1987 | Sedan | Petrol | 68 L (18.0 gal US) |
| 6 | Audi 90 2.3 E+1 | 1987 | Sedan | Petrol | 68 L (18.0 gal US) |
| 7 | Audi 90 2.0+1 | 1984 | Sedan | Petrol | 68 L (18.0 gal US) |
| 8 | Audi 90 2.2+1 | 1984 | Sedan | Petrol | 68 L (18.0 gal US) |