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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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