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I noticed relatively poor economy when I switched from 92 PON to 87 PON in my TSX. The after the second fill on 87, everything was back to normal.
The other theories as to your drop in mpg sound plausible too. Check the pump next time and see if premium contains ethanol, and what percent. Since ethanol only contains about 2/3 the energy of petroleum, that can make a big difference in fuel economy.
In Oregon, all fuel contains 10% ethanol, regardless of octane rating.
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