I replaced the stock Goodyears with Pirelli Cinturato P7 Plus (LLR) 215/55R17 94V's at 25k miles(almost 4 years old though). Original tires still had some good tread depth but I found the outer edges getting warn and that there was a fair bit of surface cracking showing up around the beads and between the treads. The grip was noticeably reduced with the wear on the Goodyears, especially on wet or slippery surfaces.
The Pirellis are a decent replacement. They handle well, certainly a notch up from the Goodyears. They are also quieter even though there is still some noticeable tire noise. I would say that the noise is more focused below the car as opposed to "in the car". The sound pitch is lower and I no longer have that sound like the rear wheel bearings are worn. The Goodyears had a definite "hiss" that seemed to penetrate and get magnified in the rear hatch area and the Pirellis have cured that. The Pirellis are still noisy on older course asphalt as are most tires.
On the highway, the noise levels from the tires seem to peak at about 50 MPH and do not get any louder compared to the Goodyears that seem to get noisier the faster you go. There was no peak. In other words, the Pirellis are much nicer for noise on the highway than the Goodyears by quite a margin. I can comfortably listen to the radio vs trying to drown out the Goodyears with high volume.
Initially, I had about a 10% hit on range but now that I have about 750 miles on them my range has suddenly returned to normal. I was running them at 40-41psi but have backed off to 39psi as the tires seemed to be a bit harsh on bigger bumps. The lower pressure has solved the issue and has not affected range.
Over all, I am satisfied with the first month of ownership and I believe these tires should perform well on the volt for many miles to come. They got excellent ratings on tirerack.com and were a #1 pick based on the group of tires recommended for the volt.
My other choice was going to be Continental Pure Contacts but they appeared to only be available in an H speed rating for the volt sizing and they were more expensive. I have Conti's on my Buick and they are decent on that vehicle.
I purchased the Pirellis from Costco (Canada) and they did a great job with installation. Properly torqued, properly filled and no balance issues.
Overall satisfied and I am glad I bailed on the Goodyears when I did.