It's time to replace the tires. I have 45K on the original tires in 30 months of driving. Based on some of the other threads, 45K looks pretty good. Currently have the Continental ProContact 235/40 R19 96W XL. Not sophisticated enough of a driver to the nuances I've seen discussed. Winter weather is not an issue, nor are high speed requirements beyond XWay driving. Thanks in advance for your recommendations.