Brenoch,
The standard factor is 1.67. In some jurisdictions, an additional 15% is applied to aircraft without reverse thrust and some apply an additional 15% for wet runway. In any event, 1.92 is the result of applying the 15% to the 1.67 dry factor.
Can you confirm the derivation of the 1.92 factor to which you refer? Your previous reply did not really elucidate your original statement.
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