I think there is at least a 10% drop in ftp due to altitude so around 360w which sounds more realistic, although I agree, it does sound low.
Your FTP doesn't drop, it's your ability to ride at it that's hampered. :)
@hippy started
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I think there is at least a 10% drop in ftp due to altitude so around 360w which sounds more realistic, although I agree, it does sound low.