There is nothing wrong with using ethonal fuel as the engine is designed to run on it. Just do your search on ethonal fuels. As a general rule you will loose about 10% of power & fuel consumption will increase by around 10%. Therefore it is uneconomical to use it as it will cost you more $$$$$ to travel the same distance.
It is the same with using premium fuel. If my memory serves me correctly I would get an extra 10 to 20km per tank on an FD1 Auto, therefore it is not worth the extra 10 cents per litre.
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