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Les Schwab always advertised siping as a way to improve fuel economy by lowering rolling resistance. I'd be very surprised if it had that effect.
It's certainly a good idea for ice traction, but then again, snow tires come sipped from the get-go.
My recommendation is to get extra wheels and run the appropriate tire for the job. It's impossible to make a tire that excels in every performance category because most areas of performance are in opposition to the others.
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