Hi, I have this question that, how do we calculate the distance an IC engine can propel a vehicle for given certain conditions? And what would be those required certain conditions? As a test case, i was looking at this engine: http://www.yanmar.com.au/industrial/la_series/l48ae.htm [Broken] now, from the performance curve given, i took the RPM approx 3200, for which the bsfc is approx 0.26 Kg/KWh and Power is 3kW. Fuel is gasoline (density=0.74616 Kg/L , CV=42900 KJ/kg) so, the brake thermal efficiency = 1 / (bsfc x CV ) [units adjusted] = 0.32 = 32 % now, as the engine is giving 3 KW of (assuming continuous) power, the input energy from fuel is = 3 / 0.32 = 9.1KW = 9.1 KJ/s as CV = 42900 KJ/kg, the fuel that comes in, or the mass flow rate of fuel is = 9.1/42900 = 0.0002 kg/s. Now, firstly, are the calculations uptil now correct? Are the assumptions (like constant power for a vehicle) valid? If yes, how do i proceed from here? Thanks!