I run premium in my Civic VX because it doesn't have Ethanol in it, 10% Ethanol and I see a 4-6 mpg drop, or about 10%, the premium here tends to be about 5% more expensive so it's worth it to me, my car also runs smoother.
The motorcycle shop that I used to work at would see a lot of motorcycles come in that were not running right because cheap gas was put in them, drain the gas and put in premium and they were fixed.
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