I'm showing a large difference in Average Power numbers between my Garmin Edge 520 and the Forerunner 935. Max Power, NP and 20 minute avg seem to be in line with each device. My thought is the 935 is including Zeros in the average. Is it possible to not include them or am I overlooking something else? I wish I was efficient as the 935 says, but I know that is not the case. for reference my power numbers have always been consistent between the 310, 910, 920, 500, 510, 810.
