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Good thread. I've started to see side skirts on big trucks, but that seems only the tip of the iceburg of what's possible. I imagine the engines are already pretty much optimized for efficiency, but vast improvements could be made in aerodynamics.
It's worth noting too that a truck improving it's fuel efficiency from 5mpg to 6mpg saves the same amount of fuel per mile driven as a car improving from 25mpg to 150mpg !
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