Originally Posted by dibbit

E5 isn't banned, so I suspect the retailers have Super Unleaded as E5 and the other pump as regular E10 so they can offer both E5/10 with just two pumps. As they no doubt sell far less Super than regular I suppose they can still achieve their targets for renewables while selling both grades. How long that will last I don't know. I think the most important thing as ever is to use the car and not to leave petrol sitting in the tank and fuel lines going off. I actually converted my boat to run on portable fuel tanks for exactly this reason - I never have stale fuel. Even if the ethanol were to destroy any seals or rubber in the fuel system, its not exactly the end of the world to change them (on my boat the only original fuel system component are the braided hoses from the filter to the pump/throttle body - everything else has been changed anyway).

Ethanol has a higher natural octane rating than petrol, so maybe that is why a high performance engine like the Koennigseg uses it. This means that on E10 they need less octane booster than on E5, so that is one less additive wasting space in your tank.

Originally Posted by Pistnbroke

I have been using E10 since I got the car and the french eqivalent without problems and 33 MPG at 75 on the auto route so I dont think you need to worry, Plug colour spot on.
The ECU and oxygen sensors adjust it all to match the fuel.