Tractor efficiency improvement by converting power unit to gas-diesel fuel system Farit Khaliullin, Ravil Latypov, Ilnar Gayaziev, Gennady Pikmullin and Alexandr Matyashin E3S Web of Conf., 402 (2023) 04005 Published online: 19 July 2023 DOI: 10.1051/e3sconf/202340204005