Thanks! I've found the way to get good mileage...is to slow down. It seems like the happy spot is 67-69 MPH. This keeps momentum up for the hills and helps keep it in OD. Any slower than that and it's shifting all the time and really revving and any faster and...well...you are just fighting too hard with the air.
Who knows...maybe it's much better at 55 mph and not in OD...but who am I kidding...
I'll never drive it that slow just to save a few bucks in gas. I'm tickled that it does as good as it does.