The GXH-50 engine uses approximately 340 g / kW. At full throttle, under load, the engine develops 1.8 kW. Gasoline has a specific gravity of about 0.74 (or 740 g / litre), so the engine will consume in one hour: (1.8 x 340) / 740 = 0.827 litre / hour. The fuel tank, with 1.2 litre capacity will last approximately one hour at full throttle. But in our experience, one hour of pull is more than a normal day in the woods. But some applications will have different intensities of use.