The air right behind the truck will be very turbulent and by and large move with it, so the car will hardly build up a wake.
So, the truck has no profit whatsoever.
Two trucks following each other close by, that's another story.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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