E10 contains ethanol, ethanol promotes corrosion.
Your car has metal components (fuel lines, engine etc etc).
All the petrol tanks at the refineries had to be internally coated to stop the ethanol corroding the tanks.
Also if the tanks were not cleaned 100% (which a lot service stations weren't due to cost) it reacts with left over fuel, the untreated tank and creates a sludge like substance & again corrosion.
Put this into your car? Personally no way.
If you only keep the car for a few years and upgrade, you might take the punt for the savings...
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