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Ok, left the boat tail off and made a nose cone with the thought of taking up the space between the truck and the trailer also. On a semi, it is easy to take up that space since they pivot a lot further back than a tow behind trailer.
I also put on a front air dam and side skirts that is about three inches from the ground. With those mods, I went from 9 to 12mpg towing the trailer.
Next time it will be the nose cone and the boat tail mods and maybe the wheel covers, wheel skirts and undercarriage sealing.
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