He is asking about gasohol, not gasoline...
US Focuses are rated to run on E85 gasohol, which is 85% alcohol and 15%
gasoline. I assume that Gasohol 91 is 91% alcohol / 9% gasoline... and I
wouldn't be certain that would be OK.
I would say no, unless it is designed for E85 or an FFV, you can also
get somewhat lower milage with E85 then with Gasoline/petrol, alcohol by
volume has ~80% of the energy that gas does.
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