It doesn't matter what site it is, James Watt's formula doesn't change.
246 to the tires was the estimate, 269 total. Try 14.3 or 14.2 stock. 13.7 is a one off ringer with slicks, and not normal.
At SILV, they didn't do 246, they were doing 225, with the top one at just over 300 with a...