Originally Posted by
kostyap
If I'm biased and will subconsciously try to ride harder on P2SL (which is kinda likely now) statistics will not help. For test to be proper now I'd have to be blindfolded and given bike at random

. The only realistic thing I could do now is to get access to special fitting bike and try to find a geometry that let's me to produce most power and then make sure that the bike I ride comes as close as possible to that geometry.
It would seem you totally missed the meaning of regression testing. You don't seem to realize that you could measure the coefficient for force that goes as velocity squared (aero drag) and the coefficient for force independent of speed (rolling resistance and frictional losses) without keeping power, atmospheric conditions, or wind constant (as long as they're known), and then characterize the performance of each bike. You could then test your ability to produce power on the bikes to determine if either truly allows you to go harder. The trouble with that is it ignores the time adaptation to change in position that says that for all but the most extreme changes, power production is limited by physiologically not position. But that's another chapter.