Their life isn't even shortened as much in heat as they were even a few years ago. Unless you do lots of highway driving, or are really concerned about handling, you'll have no issues. Even these so called "all weather" tires are real winter tires Just renamed and marketed differently. That said yes they'll wear faster.
Keep in mind as well though that winter tires won't stop as fast as dedicated summer tires in the middle of summer. Not a huge difference but enough to effect performance drivers.
And also if you have two sets of tires You're effectively doubling the life of each set since you're using them half as much.
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