I drive year round as well, in NH, but get only 2-3 years from rear summer tires, and 3 years for the rear snow tires. PS4 should be an improvement over S04. I will probably try them next (have burned up PS2, PSS, and am on Conti ECS now). Not sure I want a sticky whiner like RE71 or RA1 on my comfy cruiser. I have RA1 for summer on my turbo E36M3 (which is also on snows now).
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