Fuel ratios and heating values
Fuels can be selected from the top menu. However, if you have different components you have full editing capabilities over the constituents of the fuel including adding new components to the fuel gas. Entering the heat of formation will calculate heating value.  Oxygen/fuel ratio and mole weight are automatically calculated. The specified fuel can be saved under its own name and stored on a floppy for later use. To calculate the combustion ratio of Air/Oxygen/Fuel the ambient conditions must be specified including moisture and altitude.