Both products are the same as being high quality gasoline tailored to the purpose of use. Compared to gasoline for automobiles, aviation gasoline has more stringent conditions such as antiknock property, lead vapor pressure, oxidation stability. Therefore, aviation gasoline is manufactured with light gasoline based on high octane number alkylate. Gasoline for automobiles is made by preparing contact reformate gasoline, catalytically cracked gasoline, light straight run gasoline etc. Also, as main additives, 4-lead lead for aviation gasoline and MTBA for automotive gasoline are improving anti-knock performance.