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Hey guys, while on the knocking subject, I know our cars can run 91 (I notice a slightly knock and retarding on heavy load) but the manual recommends 93 in states that don't have 91, I was mixing 100 and 91 to get roughly a 93 but while cruising through forums I noticed that gt86 and international manuals recommend 98 ron. Now given that that makes out to roughly about 95 on our index I was wondering if they merely recommended 93/91 to get it in the hands of most car owners that pump at a typical station and not necessarily what is optimal in a perfect world. Idk if it makes a difference engine wise but I've been filling up with 95 ethanol free at a gas station off the 101 and bell called Tom's Thumb and I have noticed fuel efficiency rise both under low and heavy acceleration and I swear that it feels a little more responsive but I was just wondering everyones take on this one.
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