Congradulations Lakedude! 56 MPG on a new engine, in October? Whoa! You must live in the south. Once you get her broken in (but not before) you could switch to synthetic oil. Have you got plenty of racing air in the tires?
Keep us posted if you manage any outrageous mileage highway trips. The HCH is the invisible hybrid. I must say that when I test drove one it felt like a real luxury car. Enjoy!