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@Dammit
Yeah, ignore the IF, FTP is set at 200 watts in Garmin Connect.
Here's a file from my SRM for comparison- http://tpks.ws/O5aU
Which has a more believable figure for the average power- ~150 watts.
I was pushing on today, but I really don't believe I was pushing as hard as the Powertap thinks.
Calibration figure for the Powertap was 506, which sounds about right, so what have I done wrong?