The answer? Better aerodynamics.
Semis themselves have gotten more aerodynamic over the years, first, as the old (and hot and noisy, I would guess) cabover designs were abandoned. Then, the long-nose semis got sleeker, got better wind cowlings, etc.
But, nothing was done about the trailers. And, that big, square-lined box has got plenty of room for improvement. Take a look:
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