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Any gains you see are not going to be from more of the fuel being burned but more so from how fast the fuel ignites and how fast the flame spread happens, that is part of the idea of indexing your spark plugs is that the spark is then facing the incoming fuel/air and flame spread happens faster, dual spark plugs work the same way, igniting the fuel at two points instead of one, the same amount of fuel is burning but it's burning faster, creating more pressure right away.
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