I ran a 10k the other week and set my target power to hit ( 400W ) & averaged 399W overall but the speed was notably lower than normal for this wattage & had wind detection enabled. It was a bit windy that day but accord to my calculations around 10% of these Watts ( 39W ) were wind, so ended up finishing 3 1/2 minutes slower due to averaging only 359W in running watts without the wind included. It would be good if you could split these numbers in real time while you're running ( so you can *choose* to battle the wind ! ) & in Garmin Connect too so you can analyse it.