to keep is short and simple, the difference from stock tires to these is night and day. we drive mostly highway and the ride is substantially improved with these. they are extremely quiet running, cannot over emphasize that aspect. handling, traction are very good too. can't say much in regards to tread life as they are fairly new but based on other feedback here we expect them to do well in that area also. these tires did exceed our expectations and i would not hesitate to get them again. fyi, at suggested psi 35, we did notice a minor dip in highway mpg. we increased psi to 39 all around, noticed no change in ride, handling or noise but the mpg did bounce back to where it was before but that is just our experience with the hhr other vehicles may well differ or not. great tires and well priced too imho.