It doesn't really matter how easy or how difficult it is to emit electrons. As long as there is a spark being generated that is capable of igniting the fuel-air mixture that is around the plug, you don't really need anything else.
There is no magic bullet, no magic set of plugs you can swap in and see a 50% increase in MPG over a good fresh set of standard plugs. Or even a 5% increase.
-soD
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