Research octane numbers (RON) of the furfural diethyl acetal and furfurylamine solutions in straight-run gasoline were measured, and the liner dependences between the solution octane numbers and concentrations of furfural derivatives were found. Blending research octane numbers (BRON) for furfural diethyl acetal (106.0±3.8) and furfurylamine (193.5±7.7) are calculated. A novel method of syntheses of furfural diethylacetal by the direct interaction of the alcohol and the aldehyde is developed. To shift the reaction equilibrium a water vapour from gas phase over the reaction mass is removed by calcium oxide. Oxidative stability of the furfurylamine solutions in straight-run gasoline (test for induction period) was estimated. It corresponds to the GOST 2084-77 conditions at the furfurylamine concentrations less than 5 wt. % and exceeds value of 1000 min.