Interesting discussion. First, I did about 1000 miles commuting this summer on 27"x28mm Pasela TGs on a road bike in mostly road-bike conditions. I had 3 flats, one the first day from a staple in the office carpet, the other two during the first half of the summer as I recall. (One of those flats was when some debris I didn't see on the road cut the sidewall, and I never found the cause of the other, a leak on the inside of the tube.) So I can say I did over 500 miles at least once without a flat.

I can't be certain from RonH's opening note what caused the speed improvement, whether it was the tire brand, the tire size, or the bike, or maybe just how good he felt on those days. Too many variables to make a valid comparison. But I won't argue that skinnier tires doesn't necessarily allow one to go faster.

I'm interested in the Gatorskin results though because I got a set of 700x25 on some wheels I bought, and I'm trying to decide what to do with them. I've never ridden on any before. Are they considered high-ish performance? Puncture resistant? Good, bad, or ugly? Actually, they are rather ugly.