The first year after the speed limit was reduced to 55 mph was the first year since there was a federal speed limit that no one in the United States who was observing the speed limit died in an auto accident. What does this prove?
That would depend on how many died observing the 65 mph limit. With this limited data, it "proves" nothing.
http://drdavespsychologypage.intuitwebsites.com/Proving_a_Point.pdf