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Below is a picture I took today of the inside of a gas tank that has had E85 sitting in it since before June 9th, 2012. What's that, 3 weeks shy of a year? The car blew up in the Optima Ultimate Streetcar Challenge 2012 in Arlington, TX (for date reference), and hasn't been touched since. The owner is very close friends with our shop -practically family- and we do all the work on his car. In fact, this fuel tank has been in our shop since it was pulled last summer, with the same amount of E85 that was in it the last time it ran. Anyway, the picture: 
Notes:
-No special coating/treating/whatever was applied to the inside of the tank. It is a 100% stock original early-90s Toyota MR2 fuel tank.
- Camera was pointing straight down into the tank
- There IS fuel in there. If you look in the upper right corner, you can see the level is *just* at the orange plastic "cup" top
- The fuel in the orange cup is just as crystal clear as the fuel outside it, no clue why it looks blurry in this picture. Had I seen that it looked like that on my phone when I took the pic, I would have tried again. Sorry about that
- The black paint/dirt chips you can see outside the cup on the bottom of the tank are just that: paint and dirt. Whenever whoever put the pumps in the first time opened the tank, he never cleaned around the bulkhead (well before my time there). So, can we please consider the E85 corrosion from storage myth untrue? And as a side note, the E85 drained from this tank went into a car that we were doing an E85 tune on at the time. The car already had nearly 20 pulls on it, and it ran the same AFR with this year-old fuel that it did with fresh from the pump down the road E85. But that's hardly scientific, so that one can stay debatable for now, I suppose.
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SZR: To those concerned about leaving E85 in your tank - 
