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.
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For confirmation go to people just like you.
For education go to people unlike yourself.
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