40s is huge, but again so many factors can influence this. We have to take in account it's an Olympic year, he is probably in the best shape of his life. And with all the frustration regarding the postponement he probably decided to go all out and prove a point. Everyone is pointing to the accuracy of the actual distance, even if its out by 50m he would still have gone sub 14. I've tested my GPS on numerous measured courses and it's always very very close to spot on.
