No, the discussion isn't about ethanol vs gas. It's about adding some ethanol to gas in order to reduce knocking. That means 10-15% ethanol. I agree that 100%

No, the discussion isn't about ethanol vs gas. It's about adding some ethanol to gas in order to reduce knocking. That means 10-15% ethanol. I agree that 100% ethanol would require hermetic seals, but this is about ethanol as an additive. GM were considering using ethanol as an additive, not 100% ethanol fuel. That would require massively changing up the engine anyways and wouldn't be compatible with straight gas.