There are a lot of old wives' tales about 93 octane gas... More power, runs better...
Heck, I've even heard that the higher octane replaces the lead in gasoline... It doesn't.
The compression in the old (pre '06 series) 4-cylinder IH gas engines is not high enough to require high octane gasoline.
Gasoline will ignite with enough heat and compression. This will manifest itself as a "ping" in a gasoline engine... I'm never quite sure about the whole relationship between pre-ignition, spark knock, and ping. They may be the same thing, or maybe not, but I'm pretty sure they all stem from the gasoline igniting before the spark plug fires.
What octane does is basically "stabilize" the gasoline so it doesn't ignite too soon in high-compression engines. The gas goes bang when it's supposed to go bang...
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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