What you are describing is called an 'air dam' and along with side rails, can reduce drag but at the risk of dealing with road hazards. I understand they work but dealing with pot holes and road debre makes their design non-trivial.

Bob Wilson

 

Hello, and welcome! Glad to have you here on the forum.

On the 'silent' bit again- getting surprised reactions from people just never stops in my quiet little hybrid. It started the first week I had it, and it hasn't stopped- just last week I was driving my cousin, and he had a funny reaction. We got into the car chatting, and I started backing out of the parking space- he stopped in the middle of a sentence, jumped and shook his head and said he hadn't even realized I had started the car! I can't speak to the NAH particularly, but hybrids are so quiet and have so little vibration that it's a smooth and delightful way to ride.