From what I understand you can run the car on motor oil. But I have heard stories about the Toxic Black smoke it generates, and someone said it took quite a while for the smoke to clear up after they got back on appropriate fuel.

Why not just keep 2 gallons of B100 in the trunk? at least then if it spills its not the end of the world...

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1984 300D Water-Alcohol Injection System, Pyrometer & Boost Gauge running B100 (soon to be homebrewed!!!)