I wasnt talking about biofuels or synthetic ethanol as a fuel. Just anti-knock additives to petrol like ETBE. there are plenty of other additives but they all share one thing in common - they are alot more expensive than TEL. just using this simple example to make the point that the market will give you the cheapest option, not the best.
canard - thats french for duck right? 
I am not familiar with ETBE but I am very familiar with MTBE (methyl tertiary butyl ether). MTBE was shoved down the throats of Californians by both the refiners and the green movement as the end all be all alternative to lead as an oxygenate/additive.
Normal environmental review was thrown to the wind for two reasons: The tree huggers wanted anything but lead in their typically short sighted view and inability to examine the possibility of unintended consequence, the refining industry could now take a normal waste product of fuel production and use it as a component in process and make money off of it. We had two immensely powerfully lobby groups driving CARB policy and the left wing California legislature loved the flow of cash into their coffers.
What the citizens ended up with was a carcinogen that poisoned our environment, despite the arguments against MTBE grounded in solid science and objective economic analysis. MTBE has subsequently been banned as an additive; though its proponents true to style...characterize it with terms such as 'phased out', only to be replaced by the parallel failure of ethanol.
The status quo top down centralized planning process consistently fails in their publicly stated mission and PR releases; they succeed fabulously in lining their pockets and exploiting the sytem to their benefit.
Oneway
edit: My use of the word canard refers to the anolgy often drawn between an oblique control surface of an aircraft and a tangential and meaningless argument in conversation masquerading as an honest attempt to address another point.