Is the maximum tire pressure always the fastest on a road bike? I've seen the Michelin chart on tire pressure from another question ("[What pressure should I run my Road Bike tyres at?](https://bicycles.stackexchange.com/questions/2744)"), but they don't mention whether it is optimized for speed, safety, comfort, or some combination of these.

I have heard that the more pressure a tire has, the faster it goes. But this is not always true on a mountain bike, depending on the road/trail surface. Could it be that a smoother, less jittery ride at 105 psi might be faster than 120 or 130 psi on a road bike?