It's interesting that your mpg has peaked as you get to 20k miles. I found the same thing happened with my '03 HCH when I reached approx. 20k miles. That must be around where the cars are fully broken in. Only 6k miles to go on my HAH!

Rich

Previous car - 2003 Civic Hybrid
LMPG - 47.1

The Universe is a Leaky Umbrella