[Super73]

By my math your 1/4 mph should be closer to 127.03na and 144.75. This is only a difference of 1.20mph NA and 2.17mph on the unit.

Perhaps your converter isn't all that efficiant?

Brakes draging?

Drag Coef is worse than us some how.. The top of your bed is skinned right? Perhaps that is causing air moving under the vehicled to build up back there? Does your gate go down? Put id down next time for a back to back comparo..

But these are just thoughts.. No factual info to support.