[[https://www.generatorsource.com/Natural_Gas_Fuel_Consumption.aspx|Approximate Natural Gas Consumption Chart for petrol generators]]

[[https://www.researchgate.net/publication/327802863_A_CONVERSION_OF_PETROL_GENERATOR_TO_ENABLE_THE_USE_OF_LIQUIEFIED_PETROLEUM_GAS_PROPANE|A CONVERSION OF PETROL GENERATOR TO ENABLE THE USE OF LIQUIEFIED PETROLEUM GAS (PROPANE)]]