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My belief is, that the spark energy comes from the ignition coil, not from the spark plug.
The gap in the spark plug determines how the energy is used.
if the gap is "small" then the spark will start a bit earlier and burn longer.
But if the gap is "big" then it takes a bit more time to have enough voltage across the gap before the spark can jump and the spark burn time will be a bit shorter.
In both cases the energy is the same.
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Summer vehicle
My dad's tire pressure is much higher than your dad's! 
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