Auto makers are pushing for a global standard of 95 octane.
https://jalopnik.com/automakers-want-95-octane-gas-to-completely-take-over-1825350040
Dan Nicholson, General Motors’ vice president of global propulsion systems, said making 95 octane the new regular aligns the U.S. with Europe and is one of the most affordable ways to boost fuel economy and lower greenhouse gas emissions....a 3 percent fuel economy improvement could be attained for less than a 3 percent increase in the cost of fuel.
I found this interesting. Would play right into the hands of Mazda's high compression sparkplug-less engine they've been creating.
To make gas cheaper could they/ would they add more ethanol? E85 is 100 I believe but also returns less MPG's. It's been a long time since chemistry, I don't even know if it is possible.