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Thanks Chris, this gibes with and expands on some stuff I've heard before.

But this is only about pipeline fuels, liquid and gas. To see the full picture don't we need to include other forms of energy including coal, nuclear, solar PV, solar thermal, wind, hydro of various types, geothermal and so on? I guess the electricity producing fuels. Twenty or thirty years down the road I believe transportation will increasingly be powered by electricity. All we need is the battery technology to make it happen (another idea for an article).