In engineering school I did dyno testing of various gasoline grades in an early 50’s Jeep flathead 4 and a 60’s Chrysler slant 6. (Both engines have compression ratios similar to a Farmall Super M).
The differences in power and fuel economy between 87 regular and 93 premium were less than the limit of experimental error. (If I recall the premium actually delivered a bit LESS power)
We also tested several aviation gasolines: red (87 octane), blue (100 octane low lead) and green (130 octane ) with similar results.
We learned also tweaking fuel mixtures and timing would make no power improvments when using higher grades.
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Bottom line: Go ahead and use premium if you wish – it won’t hurt anything. And the blue Sunoco premium looks pretty in the sediment bulb(!) But unless your Super M knocks at full load on regular, switching to premium benefits only your fuel supplier.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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