Nowadays is the alternative fuels and energy resources topic highly current. Due that we decided to carry on research at electrolysis gas combined with gasoline direct combustion possibilities for empowering forestry machinery. As a proper alternative for this research we chose spark ignited, one cylinder, 190 cm3 engine with valve distribution SV. As the basic fuel was used gasoline BA 95 (octane) Natural. For torque measure we used torque sensor MAGTROL SA, for electrolysis gas consumption we used float flow meter. Gasoline consumption was measured by glass measuring cylinder. For engine revolutions per minute we used dynamo MEZ Náchod. Identification of upper and lower deadlock was provided by induction sensor and for spark timing measure was used special induction sensor. For signal visualisation, measure and record was used digital multichannel memory oscilloscope. Electrolysis gas was produced by electrolyser from electrolyte consisted of water and KOH directly for consumption without storing. In experimental conditions we reached 24,247 % gasoline saving and torque increasing. Simultaneously we confirmed CO2 emission reduction via gasoline saving. Equally we confirmed gasoline combustion temperature decreasing, which will affect NOx volume production reduction. One of our results are so called optimization matrixes for electrolysis gas flow setting due to minimal fuel consumption or maximal torque reach. This topic is closely connected to “mountain energy” recuperation with electrolysis gas use.