All gasoline sold in the states may have up to 10% ethanol by volume, that is by law.

You could probably run E85 in a stock US spec vehicle with a tune. There is less energy in ethanol and more oxygen, so the CPU needs to be tweaked to compensate for this - mostly just adding fuel to the fuel tables to make up for the lack of energy. Otherwise the car will probably run lean.

There is still debate about running that much alcohol though 'traditional' fuel systems. Some say it will eat your rubber lines, some say they have been running it for months and everything looks fine. That part needs research, or a practical trial. But as far as the fueling goes, you would need a tune for sure.

A note on Brazil, since you mention it: They have a much smaller market than the US, and their use is insignificant compared to US domestic hydrocarbon use. And as some suspected, they have recently been having soil problems and a drop of production of their output, perhaps in part due to the aggressive production they had been sustaining to this point. Seconadarily, Brazil uses sugar, which has double the volume output of ethanol of corn, which is what the US uses. The corn situation is deeply entrenched, and is a barrier to ethanol progress in this country - unless of course you want to drop the tarriffs and import fuel from another foreign source. Ethanol is not the best answer for everyone, but it is somewhat doable now, which is a plus.

__________________
2001 E53 3.0 5pd