Fuel tank: 4 of 4 variants rated.
Fiat Fullback Extended Cab 150hp SX tops the Fiat Fullback ranking by Fuel tank, at 75 L (19.8 gal US).
| # | Variant | Year | Body | Fuel | Fuel tank |
|---|---|---|---|---|---|
| 1 | Fiat Fullback Extended Cab 150hp SX | 2016 | Pickup | Diesel | 75 L (19.8 gal US) |
| 2 | Fiat Fullback Extended Cab 180hp LX | 2016 | Pickup | Diesel | 75 L (19.8 gal US) |
| 3 | Fiat Fullback Double Cab 150hp SX | 2016 | Pickup | Diesel | 75 L (19.8 gal US) |
| 4 | Fiat Fullback Double Cab 180hp LX+1 | 2016 | Pickup | Diesel | 75 L (19.8 gal US) |