I did a 300 km randonnee on my Squarebuilt custom, the one with 26x2.3" compass tires. It was really hot. I didn't get a flat.

So now I'm sitting on the sofa, bike sitting in the hallway fifteen feet from me. It's really cold today. I hear this hissing sound... First thought, had it started to rain? Look out window... no rain. Is the heat coming on? Walk to radiator... no, that's not where the sound is coming from. Walk to bike... yes, it's the rear tire going flat.