12.9? Sounds like you were utilizing the 255hp on your maiden voyage.
Congrats on the switch! I did test drive both the Civic and the Accord before I made my purchase. I too, found the extra roominess of the Accord (along with a few other perks) worth the extra dough. Of course, you found the number one drawback from moving from the HCH to the HAH: the lower fuel economy. But, it's not solely the fuel economy that should drive us to the vehicles we purchase. It's a balance between all the functions and features we crave. I personally placed fuel economy high on my list of expectations of a car. But not above roominess. Not saying that the Civic is a tiny car, but that I preferred the interior confines of the Accord better.
There is a wealth of knowledge in these forums concerning the HAH. Browse through all the threads! I'm sure you'll find a lot of information you're curious on, as well as information you didn't know you were looking for.
So, welcome to the forums. Glad to have you on board!