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here is an idea to lower drag on a semi.
Put an adjustable fin on the top of the sleeper. Make it so it pushes air up more or less with electric actuators.
Put an automotive barometric pressure electronic sensor on the back of the sleeper.
For a given load, for a given trailer, for a given wind condition, you can adjust the fin up or down to minimize air pressure between the truck and the trailer.
Then put fins on each side of the sleeper up and down the sides - again adjustable.
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