Leading the nation, Minnesota was the first state to implement a mandatory E10 law. The latest version of the Minnesota law is defined by Statute 239.792, which was enacted in 2007. It is actually pushing for E20 and above in the near future, but it depends on if the car manufacturers will warrant their vehicles for greater than 10% ethanol; currently no manufacturers do.
The exemptions are quite complete and can be found in Subd. 10 - 15, and include aircraft, watercraft, motor sport racing, collector vehicles and off road use, motorcycles, 2 cycle and small engines, etc. The law does not guarantee the availability of unblended gasoline, which must be premium unleaded and it only allows retail dealers to supply it if they follow very strict guidelines.
Every mandatory E10 state has exemptions to their blending law, because there are a number of piston engine applications that should not, and some that cannot, use ethanol blended gasoline. Unfortunately the exemptions are not uniform. They vary from only one exemption in Washington, aircraft, to a universal exemption of premium unleaded in Missouri. All states exempt aircraft usage, but most states like Oregon and Washington make it almost impossible to get unblended gasoline. Oregon is the only state that allows for unblended regular and premium gasoline for the exemptions, and then makes it almost impossible to get any unblended gasoline. All other mandatory ethanol states just allow clear premium unleaded gasoline for the exempted classes.
The following piston engine applications should not use ethanol blended gasoline:
We urge people to work on legislation in each state to prohibit the blending of ethanol into premium unleaded gasoline and to require the accurate labeling of pumps that dispense ethanol. You are also urged to write the EPA and ask them to prohibit the blending of ethanol in all of the premium unleaded gasoline produced in the country; they have the authority to do that with a stroke of the pen and have been urged to do that by numerous organizations.
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If you need information, with references, in order to frame arguments against ethanol blending, use these Talking Points.