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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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