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Mileage is about the same.
Did you have your chip retuned to take advantage of the new hpop system? It's not necessary to feel the power but most people say you need tuning to take full advantage of it, i.e. turn the hpop pressure up. Just a though, might help with the mileage and give you even a little more pop.
I've got the Terminiator system on mine and while it was a big difference in drivability w/o additional programming, David makes good use of it in, for instance, my mileage program.
ZMBYKLR, '03 Reg Cab Short Bed 4x4
Performance Truck Products, G Racing, Diesel Innovations, Absolute Performance, No Limit Fabrication, Iron Bull Bumpers, Strictly Diesel, Gearhead
11.93 @ 113mph, 7640lb race weight on 37x13.5's