Quote:
Originally Posted by kivyee
Fuel consumption is not a sign of how "good" gas is. Usually if there's ethanol in the fuel your consumption will go up. However you might have better knock resistance which means you can make more power.
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I know that ethanol gas will have worse fuel economy. But the thing is, Costco 91 gas is ethanol free, but I get worse fuel economy. That is what I am concerned about, and why I will never put any Costco gas in my car again despite that it is extremely close to my house.