Hi! We've got the Honda Hybrid 2005 a few weeks ago. That is my first car in my whole life (no, I'm not 16, just never drove before

). And I love it! It's so great! I just love it. I would never sell it.
But I have a few concerns:
1. I tried all tips, which I've found on this site (exept turning the engine off. This one is really risky), but my MPG in 37-40. I can get 41-42 on the highway, but it's so low. Desperately need more tips. Help!
2. Sometimes, when I turn the key in the ignition to take the key out, the engine still works! Not normally, very quet, but it's on!

I start the engine and turn it off again. The engine stops! What's is it? Why? Did I explain it clearly?

I hope you got it.