In real day to day life the rolling resistance of tires is pretty much a moot point. You use the tire which has the load capicity, durability, traction, and compatibility to your rims/bike that you need to surrive your ride. It's only when your pay check is on the line that this discussion has any merit.

This reminds me of a story. I had a shop years ago. there was a local group of riders (a club of sorts) that, of course, had it's pecking order. The strongest guys rode 700x18 tires at the inception of the group. They had heard that skinny tires were faster. Since they were pretty fit they did ride faster then most of the others (and faster then I did). Very soon most of the others were running 18s. As the Summer events started up my wife and I (on our tandem) would see them at the rides we liked to do. They would leave as a pack (I wouldn't say pace line as they weren't displined enough) from the start. At some point later we'd ride past some of them while one would be fixing a flat. Well they'd be in the shop every few weeks buying tubes in handfulls at a time, and the little 18 wide tubes were more expensive then the more common 23/25 ones. After a while I decided to thank them for their repeate business, asked them if they liked getting flats and if it bothered them that slower riders would pass them by when the didi flat. It took a little while but I did get them to move up to 23/25 wide tires. Of course they stopped getting any where near so many flats. They were faster with the wider tires as they weren't stopping while their buddy fixed their flat. So the moral is you're fastest not stopping. Andy.