Depends...on what you want to achieve (comfort or handling). I run 45 psi in my 17" tyres (not GY Eagle) as they have been wearing on the edges. Rides quite hard but it's cheaper than forking out $200 a tyre when only the edge is worn.
This thread might help as well:
You know, somebody actually complimented me on my driving today. They left a little note on the windscreen. It said, 'Parking Fine.'So that was nice.