they have found that on most engines there can be quite a bit of power to be had with this new fuel... of course you need a standalone engine management unit to take advantage of it... the usuall more timing and more fuel theory combines to create more power.
the thing i don't understand is, ethanol is an unwanted byproduct of the sugar industry, therefore its very cheap... how then do they justify the extra cost involved in buying this fuel when the ingredients to make it are cheaper than the old fuel??? :)