It seems many auto makers are pushing for higher octane fuel but they don't know the best way to get there.
https://www.cars.com/articles/automakers-push-for-higher-octane-to-meet-fuel-economy-standards-1420684421731/
https://www.epa.gov/sites/production/files/2015-05/documents/050515mstrs_standlee.pdf
http://blog.ucsusa.org/jeremy-martin/the-road-to-high-octane-fuels
it seems we may be headed toward higher ethanol blends hopefully with a higher octane gasoline used in the mix
https://www.cars.com/articles/automakers-push-for-higher-octane-to-meet-fuel-economy-standards-1420684421731/
https://www.epa.gov/sites/production/files/2015-05/documents/050515mstrs_standlee.pdf
http://blog.ucsusa.org/jeremy-martin/the-road-to-high-octane-fuels
it seems we may be headed toward higher ethanol blends hopefully with a higher octane gasoline used in the mix