I have heard that the EPA allows for blending up to 7.5% WMO in fuel. I have only third party evidence (search for 7.5):
http://www.theoilmedics.com/blending.html
http://findarticles.com/p/articles/mi_m0PAI/is_3_38/ai_n26899997
I did read an EPA document recently (don't have a link) that...
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