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I don't know the answer but I think this is too good a question to roll off the page. I suspect the alcohol content has some effect on the oil additives and engine wear (either negative or positive).

I found several complete old car owners manual scans. Interesting to note oil recommendations, and surprising to me the SAE 20W recommendation for summer conditions. 1950 Mercury: http://www.tocmp.com/manuals/Mercury/1958/Owners/pages/50MercOM%2024-25_jpg.htm 1957 Chevy...

Interesting, informative forum. I have a 2004 Camry with 2AZ-FE 4 cylinder engine. After reading information from this link, I question whether automaker specs for oil in US market is designed for optimum lubrication or for eeking out a few tenths of MPG for CAFE...