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A simple answer is to look at what major US fleets are doing. The one I just joined has 14,000 tractors. Latest ones use Flow Below on tractor (aero Freightliner Cascadia Evolution). Trailers have only skirts. 53' van.
Engine is 15L Detroit turned down. 62-mph limiter. 10-speed (which hurts economy). But I average 7+ mpg no matter the load. East of Mississippi River. Bunk heater. No extended indie between 32F and 65F.
Flow Vroiw us reckoned at 2.3% fleet savings per recent industry article.
USX runs only automated manual transmissions. That, and control of idle hours is probably biggest savings (given speed limiter and eiectronic logging). National truck speed limit will force buying more trucks and hiring more drivers. But will bring operational economy into sharper focus.
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