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					Originally Posted by Dale_K
					
				 
				The rear tires are part of a matched set of very inexpensive ($300 for all 4) Sumitomo tires the previous owner put on in July 2010.  I understand the risk vs reward question about mismatched tires and was willing to accept it.  The new tires are listed as "grand touring" tires rather than max performance and I was willing to accept that too.  The most I'm out if I junk them is $230 so it's not the end of the world. 
 
Seeing as how I'm not getting much tire pressure advice I'll try out some different pressures and report back.  I like the nice quiet ride and the ablility to rotate tires from side to side.  No so good for responsiveness though. 
			
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Dale,
I am sad to say that tire pressure advice wont fix this.  Grand Touring All season tires are just far too different from Max performance Sumis to ever be a good match.  Your car will feel like it is on banana peels until you resolve this.  If you like the Grand Touring A/S tires, put em on all four corners.  You will get a nice quiet comfortable ride good in all weather conditions and sacrifice some grip.  Maybe a good tradeoff depending on your driving style.