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As ethanol has a lower energy content, running leaner won't be so easy. I have never seen any car with a normal compression ratio actually running leaner on ethanol than it would on gasoline, not even the 2007 Chevrolet Celta that my mother had until 2014 which had a quite high compression that made it run poorly unless an extra amount of ethanol was added (just a remind, in Brazil it's mandatory that all gasoline has 27% ethanol) to "fix" the octane rating. It would lean just a little when more ethanol was added, but if it ran only on ethanol it would use a higher fuel volume.
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