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There's no optimal speed as there is no optimal road, nor optimal traffic.
The best speed for economy and safety is often the same as what the car or semi at a reasonable (> 2 seconds) distance ahead of you in the slow lane is doing.
It is a proper excuse for driving that slow while not really hindering other traffic. And few cars want to pass you but not that semi.
The best speed involves adaptation and anticipation and may vary a lot.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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