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I would consider methyl-ethyl blends as well if there is sufficient methanol from wood and paper waste. The issue for older engines is the valve seats made when lead was in the fuel. These can be replaced when the valve job is done. The other issue is the fuel system materials. Xylene is the common ingredient in fuel stabilizer; just don't get it on your skin. Marine, motorcycle, and aviation engines have their own requirements. Too often laws are passed without enough care given to testing technical issues. This country is too vast to rely on a one size fits all mentality. The Quality Revolution is making authoritarian governance by decree obsolete.
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