I'll second what RM-MN said. If an engine doesn't knock when burning regular fuel then using a higher octane "premium" fuel will do nothing other than cost you more money. Fuel companies have done a good job of promoting higher octane fuel as "better" and "higher performance" but unless an engine is specifically designed to take advantage of its increased anti-knock properties the extra expense is wasted. The octane rating is simply a measure of the fuel's resistance to detonation, nothing more and nothing less. The desired detonation resistance can be achieved in a variety of ways and when looking only at this property it doesn't matter how it is done.
If in doubt you can look at the Nebraska tractor test reports to see what fuel was run during the official testing of any particular tractor. For example, my 1956 Farmall 350 was run with 82 ASTM, 88 Research which would equate to a rating of 85 using the (R+M)/2 rating method that is used today. The report for my 1948 Deere M lists the octane rating as 74 but it isn't specified number that is - maybe back then there was only one rating. At any rate, it is extremely low compared to today's fuel. Neither of these tractors have any knocking when using the cheapest 87 octane available so running premium would do nothing for me at all.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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