Regular for me, we get ripped off in Canada as they charge at least 10 cents more per litre for premium which is 38 cents a gallon. Also my beaters certainly don't require premium and the price gouging isn't offset by any possible mileage gains.
All my small engines get premium as they don't have knock sensors to retard timing if needed for some reason, plus gas for them is a very small percentage of their operating cost and premium doesn't have ethanol in it. Ethanol attracts water which could be bad for things that are only run once a month.
Ian
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