I have been in the gasoline delivery business for the past 15 years. What your gas station owner guy said is completely untrue. The octane ratings are government controlled. There are big fines for selling gas that does not meet the octane rating it is sold at. This is one reason it pays to buy only major brands as they will not put regular (87 octane) into premium (93 octane). Small "no name stations" will do this to make an extra buck. But if they are caught there are huge fines.The octane rating is and indication of the fuels anti-knock abilities. If your motor does not knock under a load using 87 octane than go ahead and use it. Mine does.
