YE CANNA' CHANGE TH' LAWS A-PHYSICS. Jim at Blogs for Industry looks at the well-to-tank efficiency of ethanol and assorted fossil fuels. His research identifies the same calculation I noted to the House Republican Task Force on Motor Fuel Prices last fall. Part of the advantage of ethanol compared to gasoline is in its use of solar energy to grow the corn. There's more to the comparisons of biofuels with fossil fuels. Professor Hu has been thinking about it here, here, and here.