Interesting! Such a huge range (British manual 36psi... wow) My dealer's workshop manager in Dubai recommended 30 front 32 rear and the sales guy, who has ridden road and track on an 899, recommended 30/30 to get me started. Ambient daytime temperatures here are high 20's to low 30's (C) right now.
In case it's any interest - I remember a rule of thumb from my racing days (more than 10yrs ago, aargh!) to aim for a pressure difference of 3psi (dry track) between cold and hot tyres. Eg) If the px is only coming up 2psi when hot, drop the px one or two psi to allow the tyre to heat up a bit more. I don't know what the ideal hot/cold px difference for all-round road riding is mind you.
I'm only running mine in (a mere 200km so far) so I'm grateful for you guys' input here.