That might well have been the plan. If he woke him up, Dylan was half awake and said he wanted to sleep, and Dad tells him "Fine, you'll have to wait until I get back and I'll take you then." Which would explain why he didn't leave note. He told him. But Dylan, being a typical teenage boy and half asleep, doesn't remember that.
He wakes up, Dad is gone, he's mad. He grabs his stuff and decides to start walking and hitch a ride. He's mad... so he doesn't leave a note or try to call his dad either.
Not saying this is what happened, but it is one scenario that makes sense of the story we've heard. As a mom of 3 sons, it fits as a possibility. Dylan wouldn't wake up, Dad tells him he'll take him when he gets back, and leaves later than originally planned, because he doesn't have to go to the friend's house. Dylan doesn't remember the conversation, and takes his stuff and leaves before dad gets back, intending to hitchhike to his friends... then sadly never makes it.