I don't have enough miles on my setup to give mpg, although I don't expect it to be good. In just the little driving I have done I can tell with the 700r4 there's no way with the gear vendors I can pull double overdrive as the engine is just out of the sweet spot,
What I'm getting at is I wonder if when your in overdrive could you be off the sweet spot? I know it's a diesel but isn't their a cruising rpm that is preferable.