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BTW, nothing that anybody here linked was any more than recommendations as to gap specs, not actual test results.





You are correct on that, I tried finding actual test data but could not.
I know what you mean, I have trouble accepting things that are not backed up with empirical results, but when conditions are such that it is not practical then we theorize and try and make sense of it.
I would also like to see the actual test results to see how big a difference it makes.