The original federal highway speed limit of 55mph was enacted in the mid 70s during the oil crisis to reduce fuel consumption. States have the right to enact their own speed limits outside of the federal limit, which they do. Those higher speed limits really don't take into consideration fuel usage, and instead are about getting from A to B faster.
As shown above, highway fuel efficiency numbers are based upon speeds far lower than the 75-80 discussed in this and the many other threads on this topic.
As shown above, highway fuel efficiency numbers are based upon speeds far lower than the 75-80 discussed in this and the many other threads on this topic.
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