[FReepaholic]

...There was a post on here yesterday that a FReeper had $700 worth of repairs after he filled up with gas containing ethanol...

Here's his post:

http://www.freerepublic.com/focus/f-news/1618379/posts

[Redbob]

"...(stations) must clean their tanks, remove all water and install extremely fine filters on their pumps."

Because of what ethanol does to the tanks:
imagine what it'll do to your car's fuel system.