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I don't think it's as simple as saying you move around on the saddle more.
I genuinely think it is, when you go out for a ride, try and note down the longest you've stay in a single position.
On the road, you're constantly shifting when riding, you coast a lots more, you change gears more, you use the brakes (body move forward under deceleration) you lean for chrissake.
edscoble
I don't think it's as simple as saying you move around on the saddle more, as after a number of hours the amount of time you're in each position would add up to be the same as the one hour in one position on the turbo. I have a feeling it's more to do with the gyroscopic effect that keeps your bike balanced, and the lack of it if you're not actually moving.