Now, I realise that these are summer tires but In our recent icy road conditions with the tires skidding on the surface and with no grip, the smell of burning tire rubber was overwhelming leading me to believe that the rubber compound on these particular tires are pretty soft.
I have never had this happen with any other tires, ever, in all my driving years. I really don't hold out getting any superior mileage from these "premium" rated tires, maybe okay on the rears but would not purchase for front replacement again.

