I spent the 1st couple thousand miles driving around in D, but have recently started driving in town in 3. I haven't been paying attention to the gas mileage - I guess I bought a hummer, worrying about a mpg or two isn't on my list of things to pay attention to. I'll start to pay attention and let you know what I find.
As a note, though, my previous vehicle (BMW 325i) had a special computer program that when you were in 3 instead of D, it changed the computer to 'aggressive' and changed shift points, fuel curve, etc - VERY noticeable difference in power, but my gas mileage went down by 2-3 mpg (I was measuring back then).
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