WWWobble
This way...That way...
I'm not suggesting there's one setting for everything. Rather that you're more likely to get a usable baseline setting from the tire manufacturer than from your owner's manual. This is, again, because every tire is different and the pressures that work for the OEM tire won't always work for other tire brands and models. And that's assuming the owner's manual is accurate to begin with...
Here's an example: the owner's manual for my 2015 KTM 1290 Super Duke R recommends 36psi for the front tire and 42psi for the rear tire. What do you think happens when I mount a set of Dunlop D211 tires, go to the track, and inflate them to 36 and 42psi? Here's a hint:
http://www.dunlopracing.com/Pressures.pdf
Which source do you think has the best baseline setting? KTM or Dunlop? I know where I'd put my money...
OK. On the track I'd put my money exactly the same place you're putting your money,
and then go from there for the specifics of the day (track, pace, track temp, etc), based on what the instructors and tire reps say. For the street, I'd go with the 36/42, keeping in mind this is probably a "do not exceed" rating, because there's a lot of difference between a heavy weight, fully loaded S/T bike, versus a light, midsize naked bike, both using same tires.
I don't think we are disagreeing re psi ratings, as much as having a discussion about where a new rider goes to find out about these kinds of issues for the particular street riding in mind.