e10 fuel in a 1999 406 3 ltre coupe

It might be but if it keeps your tank clean then surely this is a good thing. Nes't pas?
 
An update -
Using 26.78 litres of E10 after 588 kms, our 2019 auto Vitara is showing a average consumption of 21.9 kms per litre over the first 2500 kms.
4.6L/100kms


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