Not exactly sure what those last two posts are saying, but;
The octane rating is tested, it will always be what they say it is, it's the dept. of agriculture that checks it.
The problem has nothing to do with octane, it's to do with the energy contained in the fuel, the more ethanol in each gallon of fuel, the less energy that gallon of fuel produces. If your engine is giving you less power, you open the throttle more to get the same, be it accelerating, or even just cruising. That's why the gas mileage goes to pot with this crap.
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'04.5 350Z - Very Motordyne.
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