Show c n s j O. O Octane t ane E Explained alRe l Your favorite gasoline pump now bears an octane num num- ber What does it mean Ray Wright marketing director of the American merican Petroleum Petroleum Petroleum Petro Petro- leum I Institute explains The number numb r is a measure measure of the gasoline's knock anti quality and is a blend of f two methods of figuring octane the ratings research method and the motor meth method dUnder d. d Under the research m method thod a typical regular grade of gasoline might get a 94 octane rating while under the combination research motor method the rating for the same grade would be about 90 whatever the technicalities the best way to determine determine deter deter- mine a gasoline's knock anti quality is to test the various grades in your car C Car r engines even in the same model lines have octane frequently varying requirements |