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About 10%. They are also a lot noisier, at least the Blizaks that I have are. Snow tires are a necessary evil for the Volt because it's FWD not AWD. When the first snow storm hit after I got my Volt I found that I couldn't get out for the driveway of my local Agway because it was on a slight incline, I had to back up and get a running start. I immediately ordered a set of rims from costco.com and when they came I bought a set of Blizaks at Costco, unfortunately Costco doesn't stock rims and they won't even deliver them to their stores, they get dilivered to you and then you have to take them to their store to get the tires put on and mounted.