What is left that I have not accounted for? It could be wind, but I do not recall any wind in either race. If there was a breeze of any kind, it would be slight. I was wearing the same tri suit and helmet. 0.7 MPH seems like a huge difference for riding the exact same average and net power on the same course in very similar conditions. If there is anything within my control that I could adjust, I would like to understand it before my HIM in a few weeks.