After getting a sidewall flat on the stock tires while on vacation, we got these in an emergency purchase. These tires are AMAZING in heavy rain--best tires we've ever had on any car in 35 years. Specific to Volt owners: We had concerns about the electric range dropping (as posted on Volt forums), sometimes permanently. Our first 500 miles as the tires broke in were on the generator over mountain highways. However, after 1,000 miles in all road conditions but snow, there doesn't appear to be any permanent difference in the electric range. We got the H version of the tire, and we slightly over inflate to 42 PSI cold.
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Tires are usually taken for granted, until the road puts them to the test.