When I travel with others, I tend to do 5 over the posted speed limit since the time wasted traveling is compounded by each additional occupant.
When traveling solo, I'll draft a semi. In Oregon, that means doing about 60mph in a 65.
I see no point in traveling slower than the slowest of trucks. It causes more lane changes, more potential for accidents to occur, and drafting a truck at a safe distance can make up for the additional speed penalty.
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