Well, I just had the Bridgestone DriveGuard Run Flats installed on the Volt. I took the car on local and state highways, over smooth and broken road service. To all those that say it makes the car ride harsher, you have not experienced this tire. I had to really concentrate to feel any difference in ride quality. Maybe, maybe a slightly heavier feel of tire rebound over pot holes. But this tire is slightly heavier, and of course, the sidewall construction is different. On intact surfaces or highways, I could not discern any difference in ride quality from the OEM tires. The noise level is the same. I had to concentrate to try to see if there are any differences. I asked my wife when we went to the supermarket what she thought of the ride. She said "same as before." The one thing I do have now that I didn't have before is no flat tire anxiety, no flat beds, no OnStar towing waits, and my dog Harry doesn't have to ride shot gun in a tow truck!