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Also, the whole reason why we would consider NOX is becuase it's less dangeous (non cryogenic and wouldn't fill a room if opened). We would be able to transport NOX without EHS approval. NOX is also ~$400 per bottle, where LOX is ~$20~$200.
The abillity of gaseous NOX to mix with Ethanol (in comparison to LOX) was not researched yet.