Honestly, I seriously doubt that putting ethanol in gasoline makes any measurable difference in air quality. Today's engines are so much cleaner than older engines even as recently as the 1990s that their emissions are too minute to even measure with ordinary testing equipment. Oxidation and reduction catalysts have taken care of the little that is left after leaving the combustion chamber.
I sure do remember when changing spark plugs was a twice a year deal. I also remember carburetors and points. Keep in mind that back in the 1960s, most spark plugs were copper non resistor plugs. Today's plugs are platinum or iridium and are fired with 80,000 volt ignition systems. Points are gone along with distributors and carburetors.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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