7 of 7 variants have fuel tank data.
| Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|
| Subaru WRX STI 2.5T Sport Premium | 2015 | Sedan | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport | 2014 | Sedan | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport Executive | 2014 | Sedan | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport | 2010 | Hatchback | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport Executive | 2010 | Hatchback | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport | 2010 | Sedan | Petrol | 60 L (15.9 gal US) |
| Subaru WRX STI 2.5T Sport Executive | 2010 | Sedan | Petrol | 60 L (15.9 gal US) |