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Actually carbon carbon chemical bonds can be double bonds or in the case of Acetylene actual triple bonds
When a double bond is combined with Oxygen it will release almost 2 times the energy of a single bond found
in a normal carbon carbon single bond like Octane. It requires NO MORE oxygen to release the extra energy.
There would be higher energy fuels to buy except I am sure the Bullsh^^t would trump its real existence.
Lastly Ethanol is pre BURNT fuels designed to lower performance and increase expense and generate political kick backs