I had the stock tires replaced with Conti Pure Contacts at 700 miles on the car. They were an immediate improvement, quieter and grippier. We've been happy with them but fast forward to 34,000 miles on the tires and they are almost due for replacement. That is pretty disappointing on a 60k warranty tire. The car is driven mostly by my wife and yes, she is the proverbial, slow old lady driver. Has anyone else seen this with their Continentals? Alternatives for a replacement that are better wearing and yet still great on the Volt?