Robert Zubrin, author of EnergyVictory: Winning the War on Terror by Breaking Free of Oil, is arguably the biggest advocate for mandating flex-fuel vehicles. Zubrin made numerous appearances last year while promoting his book.
The Glenn and Helen Show: Bob Zubrin on How to Break OPEC (Audio)
BookTV on CSPAN2 - Energy Victory: Winning the War on Terror by Breaking Free of Oil (Video)
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He is one of THE best authors on this topic.