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The frontal area on the old one was much less and look at the radius on the front sides of the box of the old compared to the flat sides of the new.
I bet that old one would have performed just as well as the new one with just a 5.3 and the lighter duty transmission as the new one does with the 6.0. If you are really getting over 10 mpg with that new one at 65 I would be pretty happy, I bet there are lots of folks getting 8 or less with that rig.
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