Pretty much what he said.
Because of the lower energy content you'll be burning a lot more of it. Does burning more justify the lower expense? Kinda like seeing cookies at the grocery store. The big box is $4 and the small box is $3, but the small box is half the size of the big one. If you eat cookies like I do those little boxes may have a cheaper face value but you spend more with just two boxes. Now do a conversion to gallons and the fact that your truck takes over twenty.
The flex fuel vehicles have more than just a sensor to tell the PCM that it is now drinking like an alcoholic, they also have improved rubber components that are more resistant. Yes you could tune any vehicle to dump more fuel into the cylinders but that doesn't mean that the rest of the vehicle should be using it. That would also not be a tune you run all the time. When I was buying my truck I read in the manuals that even flex fuel vehicles have to run tanks of regular gasoline ever so often so it is not like they are immune from the effects of high concentrations of ethanol, and they are made for it. The vehicles in the last decade were made for mixes of gasoline that were basically contaminated with ethanol, not ethanol with a little bit of gasoline.
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