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Oh, and the reason why I'm seeing grocery trucks doing 50-55mph consistently is because their GCW is probably less than half of the 80,000lb GCW Cummins assumed, so at 65mph the ratio of aerodynamic to rolling drag is probably about three or four to one as opposed one and a half to one, meaning that as long as they use their gearing well, dropping 15mph probably increases fuel efficiency by ~30-45%. As diesel prices increase/hold, even hedging will become harder, so I imagine carriers will start driving efficiently in greater numbers.
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