With respect. What I believe: The fuel today is much better than the leaded mix that we remember. It may not have the shelf life, and it may remove varnish and other deposits from ancient fuel evaporation, but it does not eat sparkplugs, it does not detonate until we put it in engines with compression well above those in tractors of that era. It is a leaner mix. It does in some cases need greater fuel flow to keep from being lean edge. but not more than 1 to 5 percent. Non adjustable carbs from the mid 60s might need a jet size increase. It is necessary to find evidence that is not one persons opinion. I will run fuels that prevent detonation in engines I operate. Detonation and spark knock are the real enemies of engine survival. Lugging the life out of a 6 cylinder IH engine because you could do that to an M is not the fuels fault. Jim
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