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If you have a turbo boost guage on the truck, become familiar with it. On my own I have found that at ~ 10# boost at 55-58mph that we are running on a relatively flat road, no up or down grade and no wind.
If I notice either less or more then something outside is affecting operation. Wind, or grade, dragging brakes.
But it will take some time and attention to learn where the boost guage will reside on a flat road with no wind.
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