The synthesis of gasoline from methanol and methanol/water mixture, the products of the partial oxidation of methane, in the presence of pilot samples of zeolite catalysts with the MFI structure has been investigated. It has been shown that the presence of a significant amount of water, 1.5-2 times that of methanol by mass in the mixture, leads to increased gas formation. It has been found that formaldehyde and formic acid impurities reduce methanol conversion and selectivity for gasoline.