Speed vs consumption charts are only possible with an onboard computer or a scan gauge. Neither of which works with most motorcycles.
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That and all you guys must have magic Insights.
Those charts are fun to look at. I have an Insight. I have put 150,000 miles on it over 7 years. I know the car. My best two tanks were 69 mpgUS at 65 mph even with safe drafting of large trucks. More usually around 66 mpg summer and 58 in the winter slush. That chart is way high on the slow end. That is some brief optimum on a computer that is very optimistic. Highly modified plug in Insights can do 100mpgUS tanks (with unaccounted for wall power) at 30 mph which is stupendous, but fall right back to 70 mpgUS at 65mph on a long highway trip.