That's 0.0393" (or typically 0.04"). As the spark center electrode wears, that'll get even bigger.

A couple of questions:

1. Have you found that this increased gap affects ignition coil longevity or gas mileage?

2. Now that our gas contains so much more ethanol (which on its own has a high octane rating and therefore resistant to knocking, but under high compression ethanol is more prone to pre-ignition), have you considered reducing this gap a bit?

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