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While there are pauses in the black boat's charge - and even the odd temporary reversal - the average over the last few days is around 0.6 - 0.7 knots faster and sometimes it's a full knot quicker every hour for a whole day.
Thats the sort of numbers that keeps the opposition awake at night - or at least used to until they became resigned to following in Mike Sanderson's wake and have now focussed on the other two podium positions.