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The only thing that would improve mileage as far as sparkplugs go is having more than one per cylinder. Ask any pilot of a piston engine plane that does a magneto check on warm up. They will tell you that they get more power running off both sets of plugs than they do running on one set using the exact same throttle setting. This is due to a faster flame propagation through the cylinder from sparks starting in separate locations. Note, multi electrode sparkplug (3 or more) do not have the same effect because the spark only goes between the center and one of the other electrodes.
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