I've never actually done a 20' power test. I just go off group rides where I was at the rivet for 20', where I know I didn't have much left at all.

Luckily, living in Socal, it's not that hard to find group rides like that.

All FTP info I have is estimated, I've only tested 5s, 1m, 5m powers.

Speaking of fail, I did a sprint at the end of my last 5m 300w effort yesterday and only got 705w for 12s...so yeah...fail.