Flex fuel cars

This seems to be in the news a whole lot, and it seems that a number of companies are pushing towards it. Some people say that it costs ~$100 per car, to be fitted to have flex fuel.

Some manufacturers, Toyota, and Honda, were not overly thrilled with the idea of flex fuel.
1) They have their hybrid technology, which they want to push.
2) The use of ethanol causes the formation of formic and acetic acid, which could damage your engine, as well as seals.

In order to counteract this, there are products out there to prevent the corrosion, but it could be a matter of time for the components to fail, due to improper protection with the preventative measures. I think Toyota will be coming out with a new flex fuel car that is not a retrofit. Instead, the parts, will be more resistant to the corrosion. For the completely deranged (like me), I like my car to last basically forever, with little maintenance.

Personally, I'd be leary of the retrofits, and instead, go with something built from the ground up, to handle the acids from E85.