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As far as Premium giving better FE than Regular - are you comparing Regular w/Ethanol to Premium without?
You should see an increase if you don't have Ethanol, and you are best off with as low of octane as necessary that doesn't contain Ethanol.
You're lucky if you can get 87 without. 91 is the only thing without in this area.
From my latest tests, my cycle (SV650n FI) gets about 5% better mileage on Premium (55 hwy) over Regular with Ethanol (53 hwy).
Jay
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