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Originally Posted by Orcrone
Not necessarily. There are a number of trade-offs. Higher pressure, better mileage but rougher ride. Lower pressure the opposite. Toyota's are known for being quiet vehicles. It would not surprise me that their tire recommondation is based on providing a smoother ride. It's very possible that raising the pressure several psi will not affect handling.
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Here is a good article on tire pressure from the TireRack, the biggest mail order tire seller.
http://www.tirerack.com/tires/tirete...e.jsp?techid=1
It shows the issues surrounding both under and over inflation. Below I quoted the overinflation section since this msg thread is looking at overinflation to get better mileage.
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Disadvantages of Overinflation
An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when encountering potholes or debris in the road, as well as experience irregular tread wear. Higher inflated tires cannot isolate road irregularities as well causing the vehicle to ride harsher and transmit more noise into its interior. However, higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures.
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P.S. the TireRack link above also has several other related links at that web page(upper right corner) that discusses various issues surrounding tire pressure and wet vs dry; outside temperature; high speed driving; etc.