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O.K. I'll bite. If all I have to do is the most basic of modifications to my vehicle, it would probably be cheap, and so easy just about anyone with a pulse could do it. If the perfect biofuel came along in this scenario I'd be all over it, provided I didn't have to pay more for it that what I currently pay, and that it was actually a cost-effective solution unlike ethanol.

Any more ethanol in the current fuel at the pump, and you may as well kiss your engine goodbye (along with any drivetrain warranty), unless of course it's already flex-fuel capable.

If all I have to do is the most basic of modifications to my vehicle

If you have a diesel engine, you can run the thing on cheaply produced vegetable oil...but you have to either heat the oil up before you use it or get the engine hot with a separate tank of diesel. Not complicated but not too cheap of a conversion to get much interest. A biodiesel blend can run with little to no modifications, but you still use diesel and you have more in processing to make the stuff. Not a bad deal though and this market shows a lot of promise.

For gas engines....gas sucks. You can make ethanol from all sorts of products but ethanol is still a pain to work with...but ethanol has the name recognition so ethanol it will be for a time.