Tire pressures affects couple things
1. load rating - higher pressure increase payload. It is especially true on commercial truck tires where pressure may range from 80 psi to 110 psi . The difference in pressure could mean extra 1,500 lbs carrying load per tire.
2. ride quality - lower tire pressure usually provide a better ride.
3. handling - higher tire pressure usually resulting a stiffer tire. Stiffer tires may give better handling
4. rolling resistance - higher pressure - less rolling resistance - better fuel economy
What's the balance? Ride? - Performance (handling, fuel burn, loading)..
I would trade ride quality for better performance.
