Its funny when old threads are dug up...no really it is :-p
But anyway, I actually do have a header currently installed. I've been working on the mileage difference, but I've also removed some of the forward grill/aero pieces.
It's hard to tell difference currently. I have a good set of pre-header data on 135miles where I had nice weather without terrible traffic incidents. I have yet to get a good spot of data because traffic/weather has been terrible in PA. As far as I can tell, the header is still leaving me within 10% of the original high-mark, and that 10% can quickly be made/lost due to rainy weather and poor traffic conditions.
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