After having to replace the fuel tank, fuel pump, and fuel sender in my 96 Honda Accord (<30K miles) after it sit for about 3 years, I started doing research on E10. What I found was that it will eat up anything if given enough time. It has less BTU content which gives the engine less power and less mpg. It especially effects low compression engines. The newer cars with vvt can run higher compression and compensate for the lower grade fuel. Ask anyone who has run E85 in a flex fuel car and see what they have to say. Less power, higher cost per mile. Ask a marina operator what kind of fuel they have and they will tell you they only have Non_ethanol because the ethanol will distroy a boat engine and possible eat holes in the fiberglass tanks many boats have. Ask at any airport and they will tell you that the FFA forbids ANY ethanol in their fuel.
You can build a ethanol powered dragster engine and get 1500+hp but it will only get .07 mpg. The new cars that were designed to run E10 will do fine. The fuel systems are sealed up better so less water in the system. Engines could be designed to run pure ethanol and do great. The problem is a lot of us have cars designed to run gasoline, not ethanol but we are forced to (almost) to use a fuel our engines were not designed to use. We have our Federal Goverment to thank for that. I hear they are going to raise the ethanol content to 15%. They say any car built after 2007 will run fine with it. Not a word was mentioned about the older cars. I guess they are trying to help the economy by making everyone buy newer cars.
I am sorry about the rant, but we have been served a raw deal by the big corps and the government.
We just got back from a 400mile trip. I searched out stations that sold non-ethanol gas and and got 20 mpg on the road and my old 84 ran like a new car. Over the last few years, I would get 16 to 17 mpg and the car did just OK. Type "non ethanol gas" in a search engine (google) and you can find a web site that list all stations in the US that sell NON Ethanol. It will cost about the same as diesel but your cost per mile (if you have an older car) will be less than it will be with the E10. OK, I will shut up.

Paul

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84 500 SEL (307,xxx miles)