I don't think you have to change your driving habits "drastically" to see good mileage. I am not heavy on the gas, but keep up with them on the highway just fine (well..ok, not doing 90 like some) and get around 48-50 MPG. No tailgating semi's, no going down hill in neutral. Don't really need it, the way the engine works. I pretty much drive like I always have and do just fine. Now, if I was in my early 20's with a rocket under the hood, that might be different.

Have fun, you will enjoy it!!

Bob