I am very curious to hear more about your experience with tires. You seem to switch between two tires that I am considering as replacements. I have used Tourance tires with very good results and get similar mileage as you report. I am considering replacing mine with the Heidenau K60 because I want to start diong a little trail riding. The vast majority of my riding is back roads and Interstate riding during my commute but the mountains keep calling me. There are some ATV/OHV trails near me that I have run with Tourances but I know the knobbies would be better.
How much worse are the road manners of the bike with the K60's as opposed to the Tourances?