Wood gas as engine fuel. Rome, Italy: Food and Agriculture Organization of the United Nations, 1986. FAO Forestry Paper 72 ISBN 92-5-102436-7Teoksen verkkoversio (PDF) (viitattu 13.2.2016). (englanniksi) Sivulla 15, PDF-sivulla 21. 2.1.4 Resulting power output Lainaus: "Assuming that the engine modifications described above are correctly implemented, decrease in maximum power output of petrol engines without turbo or supercharging can be limited to about 30 percent. Turbo or supercharged combustion running engines on producer gas can have power outputs equal to those in petrol operation."
