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-efficiency-calories-per-gra

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-efficiency-calories-per-gram-per-kilometer/ 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-strategic-planning https://www.smestrategy.net/blog/using-the-6-thinking-for-st...