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> the source cited for it being the most efficent self-powered means of transportation is from March 1973

what was the source please? ive actually tried to track this down for the steve jobs quote but couldnt find it

I had saved the chart here, Google reverse image search led me to this article https://streets.mn/2014/05/22/chart-of-the-day-travel-effici... which says it's from Scientific American.

There were a few other hits as well. This one mentions the Steve Jobs quote and corroborates "Scientific American, 1973" https://www.smestrategy.net/blog/using-the-6-thinking-for-st...