Thanks to some of your recommendations I ordered a new pair of Continental 4000s tires and they came in this weekend. I had a pair of Michelin Pro2race tires on my bike previously. For the past 3 weeks I have been commuting to work 2 to 3 times a week 29 miles round trip. The route is a combination of good highway with bike lane, country paved road, 1/2 block of sidewalk and .7 mile of hard packed dirt/gravel combination with quite a few pot holes to go around. My bike has 700 X 23 tires on it and no room to go any bigger. I considered 25's but there just isn't much clearance even with the 23's. Today was the first ride with the Continentals and there was a noticeable difference in the ride. It is quite a bit smoother, and yes I have the same pressure in them as I had in the Michelins. I run 110psi front and rear and I weigh 183lbs. I always liked the Michelins and never had a problem with the ride, so I was not even thinking about the ride when I bought the Continentals, I was looking for more mileage. My only complaint is that the all black Continentals don't look as good as the colored Michelins did. The Continentals also have wear indicators which I think is a good safety feature.