The fuel consumption of a typical 2-stroke (2Y) engine depends on its size, power output, and usage. As a reference, engines like the Rotax 582, which is a 2-stroke gasoline aviation engine, have a brake-specific fuel consumption (BSFC) of about 0.699 lb/(hp·h), equivalent to 425 g/(kW·h) and an efficiency of around 19.3%[1].
For real-world estimation, if a 2-stroke engine produces around 40 horsepower, at full load, it would consume approximately 28 lb (about 12.7 kg) of fuel per hour, or roughly 17 liters per hour, assuming gasoline with a density of 0.74 kg/L[1].
At idle or low loads, 2-stroke engines are much less efficient, with fuel consumption dropping to much lower values but with even worse efficiency. For small engines, idling fuel use may be as low as 0.6–1 gallon per hour (2.3–3.8 liters/hour), but this varies with engine size and application[2].
Because 2-stroke engines are commonly used in motorcycles, boats, ultralight aircraft, and small power equipment, their fuel consumption rates are generally higher per unit of power than comparable 4-stroke engines[1].
For exact consumption, specific engine model data or manufacturer documentation should be referenced, as real-world use, load, and tuning substantially affect actual rates.