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			Longer tread life?  Consider all season tires.  You will give up a little ultimate dry grip for longer life and 3 season use.  A good compromise for the great white north. 
 
Kumho, Hankook, Yokohama and Bridgestone all have good A/S choices but I have no direct experience with them on a Boxster here in SoCal.  I do have Yoko A/S tires on the wife's Lex and they are very good tires.
		 
		
		
		
		
		
		
			
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				2009 Cayman 2.9L PDK (with a few tweaks) 
PCA-GPX Chief Driving Instructor-Ret.
			 
		
		
		
		
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