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@nick_h.
I wish I understood petrol science. But I don't. My mechanic tells me the alcohol in E10 could dissolve parts of the fuel pump on my '94 K series BMW if I leave it in the tank for too long. But nobody knows how long. I started it up after leaving it for n months with E10 in it, and the stink from the exhaust was worse than anything I've smelt from any vehicle, ever. I felt deep shame.
Edit: Millers makes this claim about Ecomax: "Improved combustion and engine cleanliness drastically reduce emissions of hydrocarbon (HC), carbon dioxide (CO2 ) and nitrous oxide (NOx)." Wouldn't you get those benefits from having good fuelling and a newish cat and newish engine oil and all those other things you get from good maintenance? Does the additive only benefit knackered or badly maintained engines?