You have the truck I wanted (but wasn't out yet) when I bought mine. You need to put some miles on that rascal and then come back and post a report!
Also, don't trust the onboard computer. I track my mileage in Fuelly and my onboard computer varies between spot-on and as much as 2MPG optimistic. I don't think I have ever actually gotten better MPG than what the computer says. It's almost always 0.5 to 1 MPG worse than what the onboard computer says.
I really need to go do a test drive on an ED. [other voice in my head:] No, I don't. My truck is less than 6 months old. I need to keep it at least 2 years before I seriously consider trading it in....