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Ethanol has *higher* octane rating than petrol.
It also has lower energy density than petrol.
So there are lot of variables to balance.
Generally, unless car is tuned to specific octane, using higher octane will not net any extra HP. Using petrol only will net higher MPG due to higher energy density though.
5-10% ethanol does very little in modern cars. It only lowers the MPG somewhat. ECU will compensate.
E85 on the other hand, is great for turbocharging. 102 RON.
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Thank you for your time,
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