[Diy_efi] Is E85 worth it? E85 <> always 85%

[Rick McLeod]

one other little E85 tidbit:
 
E85 fuel is not always an 85% blend of ethanol and petrol.
 
Here in my state, which is aggressive in deployment of E85 (why I don't yet understand) is that the product E85 is pump labeled "Blended Gasoline w/ NOT LESS THAN 70% Ethanol" which I understand to mean that it can contain between 70% and 85% and be sold as E85 product.
 
What does this mean? To those of you who are doing a duel fuel static tune, you may not get the expected results w/ every tank full of E85 due to the stated production variances!
 
Just a little discovery over the holiday while filling up.