Hey I'm actually still just finishing up the swap now. (Should be done by June if everything goes well) once I get it back on the road ill be able to give more info on MPG and whatnot. I've done quite a bit of extra work to the Hemi while I was at it so its hard to say what the MPG will be, there will be more power though with the cam, headers and everything else.
I've got a build thread of my progress over on dodge talk forums
Someday when I get the time I'm going to make a thread on my build over here as well but here's a link to my build thread over there for now (just take out the space between "dodge" and "talk") http://www.dodge talk.com/forums/showthread.php?t=367796
If you have any other questions feel free to ask and ill try and help out the best I can.