Hello everyone, I stumbled upon this thread today and have worked my way through all your very insightful and well thought out posts. I'm thousands of miles away from this case, so have absolutely no local knowledge to offer, nor many new ideas of my own.
I have flitted between thinking this is a worst-case carjacking/abduction scenario, and thinking this was a meticulously-planned 'disappearance.' I don't know exactly what I think yet and with the patchy information we all have at the moment, can't see myself coming to a conclusion anytime soon.
One possibly far-fetched thought I do have came to me after Steadfast's post about the illegality of filling up your own gas tank in Oregon. A number of posters, who I assume are also U.S.-based, have commented that they didn't know of this. Having entertained the thought that Daryn may have staged a well-planned, at this stage seemingly watertight 'disappearance' in pursuit of some sort of new life, and bearing in mind this filling up law, perhaps this presented Daryn with a stumbling block on his journey. Knowing his gas was low, and wanting to protect himself from being recognised, he may have stashed the car and removed the number plates and then hitchhiked with another vehicle.
However, this really doesn't explain why the contents of the vehicle were left as they were. Although, if he WAS trying to feign an abduction or other foul play, that would have been a pretty perfect example of how to do so.
The really puzzling bit is the cat. I suppose if I were to fit it in with my hypothesis, knowing how precious his cat was to him, I would say either the cat is with him, or was anonymously - as an earlier poster suggested - dropped off at some sort of pet shelter.
I'm not totally convinced by this hypothesis, but it was nagging me!