Got a bit busy...

Three trial... getting better at doing these I think...

I have gone back to thinking the Silca calculator reads high 15-20psi for riders of my weight ~60kg/72kg (bike+rider)

Some of my observations/conclustion:

1. on very smooth pavement ~80ish psi tested lowest Crr, but the difference in Watts between 60-80 was less that a Watt.. imho 60psi would be the better practical choice given 1) comfort & fatigue 2) likelihood of mixed road texture over totality of ride meaning that over the ride a lower pressure would be better performing 3) almost no performance penalty for going to lower pressure... ~80psi is what silca recommends
2. on textured pavement with some cracks 60psi (vs ~80ish psi to 73psi as predicted by Silca calculator) seemed to be the better choice over two trials..
3. I observed a bowl shaped curve, but did not observe the steep, marked impedance increase as seen in other's analysis.. still improving my process at getting better data.. so work in progress... I have pretty low BMI so could some of this effect be much lower for me??