Honda Civic Hybrid - 2 months

I've been driving my new Civic for two months. Took her in for the first oil change today, 8022 miles (oil life @ 15%).

The average millage to date is 44 MPG. This is up from about 42 MPG when she was brand new. The current tank is running at 45 MPG. Why is it improving?

1. She's getting broken in and runs easier?
2. I am learning to drive in a manner that improves the millage.
3. The motor oil is breaking down, getting thinner so she is running easier?

We'll see if the average MPG drops after this oil change.