On some it seems it does and on others it seems it does not, so I figured I'd ask and get a definitive answer...

On such things as an Agate Necklace of Quickness, which has a +5% out of combat run speed buff (or it's purple version which is +8%...), does this stack with the Hunter's 'Find the Path' skill?

Also, I've noticed that the Tomes of Continuing Quickness (+5%) and the +10% Run Speed Boost (90 min), do not seem to stack with any coffee that I've used them with, and indeed, tend to blow away the coffee buff if it's up when either of the two above items are used.

So what DOES stack with what, in regards to out of combat run speed?