The current Lexus GS covers up to 1,320 km on a full tank, based on combined-cycle consumption. Figures below are the best-range variant in each generation.
| Years | Powertrain | Range |
|---|---|---|
| 1993–1997 | Combustion | 769 |
| 1997–2000 | Combustion | 702 |
| 2000–2005 | Combustion | 647 |
| 2005–2007 | Combustion | 823 |
| 2007–2012 | Combustion | 855 |
| 2012–2016 | Combustion | 1,375 |
| 2016–2018 | Combustion | 1,320 |
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.