OK, lets do a little clarification:

1) When the term "coasting" is used by me, I'm speaking of mainly anticipating a stop ahead and pushing the clutch in, go to neutral and watch the FCD go way up. This is on level or close to level roads. Not going down the backside of a mountain road.

2) I can't see how any damage would come to an Insight with a manual transmission. The engine will continue to run until the car slows down enough for autostop. Which components are being harmed? Drivetrain? Hybrid stuff?

3) Technically, if coasting is illegal, then the Insight will get everybody in trouble. They all do autostop from about 18-20 mph, then you are coasting.

4) How would anyone not riding in the car with me know that I'm coasting?

Now I have a tune stuck in my head... playing over and over.
"I fought the law, and the law won".
It's all your fault, Jason.

Regards,