Been making some runs back and forth to the Woodlands with Dark Aero attached and been gitting around 24mpg and 25mpg coming back at 65mph with some small city slow downs and a ton of signal lights in between.
I did experiment last night at 51mph on a some what flat piece of road and the indicated mileage was between 38-41mpg. I'm not sure I'd ever want to go that slow fer a long distance trip.