The current Subaru Legacy covers up to 1,049 km on a full tank, based on combined-cycle consumption. Figures below are the best-range variant in each generation.
| Years | Powertrain | Range |
|---|---|---|
| 1989–1995 | Combustion | 667 |
| 1994–1997 | Combustion | 690 |
| 1997–1998 | Combustion | 638 |
| 1998–2003 | Combustion | 625 |
| 2003–2006 | Combustion | 831 |
| 2006–2009 | Combustion | 1,123 |
| 2009–2015 | Combustion | 1,049 |
Range is calculated from each variant’s fuel tank capacity and combined-cycle consumption (tank ÷ consumption × 100), for the best-range variant in each generation — real-world range varies with driving style and conditions. Figures outside a plausible range for the tank size are excluded.