Charlie, you're doing wonderful, you're already far exceeding the EPA!
Look what you are already doing. I noticed in the database that you began in the upper 40's, worked your way through the 50's and now in the 60's.
You've obviously learned alot and applying your knowledge in your drives and the only thing I could add is not to get too comfortable in what you are currently doing.
My case in point is that I lingered in the 50's
way too long and got comfortable.
Then Lakedude and rjbarlow showed up here and knocked me off my comfy chair and indeed, I was
not as efficient as could be. (Thanks Dudes, really)
So here I am today also thinking I'm doing everything I can. But am I really?
Somehow I doubt it.