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Ptero, I like your input. Thank you. Aerodynamic losses on a big rig are great but the amount of momentum in it keeps it going. Drag is a force, F. Which can be calculated and reasoned to a particular number at a given velocity. Force is also the change in momentum, F = mass*(change in velocity).
Meaning a heavier object will maintain velocity longer than a lighter object at speed with the same amount of force resisting motion. HOWEVER, the amount of energy lost due to drag is the same amount of energy needed to be replaced by the engine to maintain speed over time. So even though they weigh more, the engine is still working hard to replace the lost energy.
I would think most of the efficiency in driving a big rig comes from the drivers who play the terrain and have TONS of experience being on the road everyday.
IMO, the reason diesels get great gas mileage for their size is because THAT IS THEIR BUSINESS!
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