Well, after 1367 miles I got my first flat. I blame Texas. There are in fact thorns here! The leak must have been a slow leak because I did not discover the flat on a ride but when I was about to go on another ride.
Anyway, I successfully removed the rear wheel, after reviewing Beanz's excellent video: http://www.bikeforums.net/showthread...1#post13041391
I removed the tire with my handy dandy levers, removed the tube, found the pinprick size hole and patched it. So far so good. I could not find anything on the inside surface of the tire, even though I felt carefully and looked carefully.
So, other people in the rv resort where I spend winter are saying that they get flats all the time. Any suggestions? I am assuming it is thorns as my dog keeps getting them on her feet. Is that slime stuff a ripoff or does it help? Someone here said he just put slime in his tires.