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I frequently listen to semi rigs as the pass by. Yes I drive 55 mph. The quietest ones in particular have a smooth junction between the trailer and the cab. Frequently they are very well matched and have have smooth rounded contours. at the front. They also have strakes between the back of the cab and the trailer wheels.
I can only assume that quiet equals efficient.
BTW my 99 Ford mini van with 170,000 miles has the 3.8 engine in it. I see 27mpg many times on the ultragauge.
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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