I usually start at pressure in manual 28/32 psi and adjust slightly for load. I use about 1psi more than manual for all-around riding since I'm heavier than average Japanese bloke.
On my VFR, I use Honda's recommended 32/42psi for 200-lb load.
Be careful of using lower tyre-pressure to make up for poor suspension tuning (Ford Explorer). Lower pressure causes more flexing and heat, which is not bad thing on track, but can be overwhelming on rougher street roads. Hitting pot-holes can also pinch tyre and damage rim.
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