I went 50 miles on my bike today, and I feel OK. So, altogether, I went 70 miles this weekend. I had some problems with new patches that wouldn't hold. I had to pump up my tire every few blocks. When I got home, I threw those patches away. I'm going back to the old type of patch. It was a beautiful day. I did not drive my car at all! I think this is a great way to save on gas.