You're ASSUMING the 89 octane has a Research Method rating of 93.
The difference between Research and Motor methods is TYPICALLY 8-10 points, BUT it could be more, OR it could be less.
89 octane... What if the difference is only 4 points on this batch? Now you're running 91 octane (Research Method) fuel in the tractor and risking damage from excessive detonation/pinging.
The manual says AT LEAST 93 octane by the research method. IIRC, the octane rating on "regular" fuel was 95 using the research method in the heyday of these tractors.
Only 93 octane premium fuel can be guaranteed to have AT LEAST 93 octane by the research method.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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