Understand trying to "go with the flow". I do it too, both above and below ideal speeds. In Washington, the truck speed limit and the maximum speed is 60 for a huge part of the highway system from Olympia to past Everett, so it is pretty easy to take it easy
Get out toward Idaho on I-90 and it gets just like you say, big distances and people in a big hurry. I find a trucker with a light load and cruise control, and shadow him at a safe distance.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears