I think pretty much everybody realized before studies began surfacing, which confirmed it all as a total crock.
Everybody but the government.
But for the US, it essentially replaced ethers (MTBE) as an oxygenate in reformulated gasoline.
But, in RFG, it also enhances the octane. Yes, regular blendstock for E10 blending is refined to 84 octane for regular, and 90.5-91 for super. The E10 does the rest.
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