I live next to a UPS center. I leave for work the same time they do and when i can i draft them at a safe distance at 45 - 55 all on single lane roads all the way to work.
I would think a UPS, or delivery truck like Frito with a much larger rear are much better drafting choices. The pillow is much lower to the ground with less turbulence than a semi's taller rear where the pillow goes over the car. Behind a semi your really mostly driving into the less ideal turbulence in the undercarraige and wheels. It's probably safer too.
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