I think 70 mph is fine for this stretch. But if you think you are safer at these speeds or burn less gas than at 55 then you are mistaken. The energy in an object increases exponentially with velocity. That means at speeds above say 60mph stored energy increases substantially more per each 1 mph increase than at slower speeds, let's say from 30 mph. This means longer stopping distances and more damage to limb and vehicle at the faster speeds if you hit something because you have to dissipate more energy to get stopped.
Dick R's math is correct for an increase in SL from 65 to 70.
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