Unless the pump says on it Certified or Guarantied 100% Ethanol Free it will at any grade . Plus the stations are allowed to put in up to 10% Methyl Hydrate (more alcohol ) . Year back when I was still doing Drive Clean Repair , I did a weekend seminar on fuel additives ect. and there effects on the engine . Second day we were to bring in a sample of gas from local station and we did lab tests on them . There was anywhere from no alcohol present to 28% in one sample and that was "high octane " . After that I started running Sea Foam in regular gas year round and have never had carbon , pinging, or carb issues in anything I own since then and that was about 8 + years ago. Sea Foam although flammable is not as easy to light as gasoline helping to raise the octane rating . I have had costumers bring in the equipment telling me that it was't running right and now will not start anymore . I ask them what did you do , and they said put Sea Foam in it . Ok , how much ? The whole bottle they said . Well a little didn't help so kept putting more in they said . More is not always better .
Dave


no more mow it's time to blow 
/ 91 litres of fuel divide by $15 tax in $0.75 / gallon or $0.165 / litre . What is the difference between reg. and high test ? Around here it is about $0.25 per litre . Do the math . I also get better fuel millage using it all the time . It can be had cheaper in 1 gallon cans but not everyone caries it like that . Every time it goes on sale I stock up. I prefer the 8 oz can as they are easier to handle .