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Headers aren't gonna do squat for mileage. They only benefit in the torquey RPM range. And if you are hypermiling, you will be well below those revs.
I would be disabling half of the V8. Remove the pan, unhook the rods on one bank and secure them all at TDC, put clamps (nut & spring kind instead of gear) on the empty rod journal oil holes to stop the oil spray. Disable the valve train on the same bank. Voila, a 2.5 four banger.
And aeromod the living crap out of it.
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