My Outside numbers are always higher. I use a Kicker indoors and a Quarq on my MTB. When i do MTB races my 20 min average power is higher than the kicker 20 min efforts and FTP test. Many of the MTB races i do in Brasil have sustained dirt roads with rolling hills so these sections are time trials 30+ minutes flat out. My best one was right off the start of a race dirt roads for over 30 min I averages 425 watts for the first 20 min at 180 pounds. My last kicker FTP test I averaged 407 watts at 185 pounds
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