Just a simple question. If I shift to neutral at a higher rate of speed (say, 60mph), and then shift back into D at that same speed, does that cause any significant stress to the transmission, the engine, anything? What I'm wondering is if I can coast (especially downhill) in neutral to save gas, and then shift back into gear when I need to accelerate again, all at freeway speeds. And yes, I'm aware of the safety risks involved with that. Just looking for an answer to the question. Is it ok to do from a mechanical standpoint? I would greatly appreciate advice.