I believe the whole idea behind the plug is that all of the fuel would be ignited. You would actualy be suprised as to how much is lost as a result of spark. Bosch proved it's worth just as Mallory ignition systyms and twin plug heads. But I do get better milage it was not the gas. How long ?? are they worth the $ amount not again. It is a sound theory but so are battery powered cars but as of late the technology is not there yet.

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Flyboy