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Thread is kind of old, but what's the purpose of this?
If you want maximum mpg just for bragging rights, you want the highest BTU/gallon mix that barely hits the octane requirement. That means mixing something high octane like toluene or paraxylene with diesel. ECUs are generally programmed to only use spark to compensate for knock, so you'll lose efficiency quickly if you drop much below the recommended octane rating.
I don't think ethanol free 90 is going to beat 87 in terms of cost, but if you're going to add 90, you can mix in a tiny bit of diesel to bring the octane back down.
Biodiesel harms cars because it has methanol, while normal diesel should be fine, I think.
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