Originally Posted by The Black Pig
I have taken advice from a scientist from the coryton refinery not to ever use Tesco fuel and stick to the major suppliers such as Shell or BP
I think there is a bit of stigma to the supermarket fuels. But as the Coryton refinery hasn't existed for a decade, the scientist may have been confused. Or a Scientologist?
The short story is that all the vendors just buy the exact same fuel from the exact same refineries. It is manufactured by the refineries to precise legally defined standards. What some vendors then do is add additives to help with marketing and selling at a premium. The interesting thing about these additives is that the vendors make only vague claims as to their purpose/benefit so as to avoid having to prove anything.
The real differentiators tend to be how long the fuel then sits in a forecourt tank or how much junk is in the tank etc. A bit like lazy landlords messing up beer that was perfectly good when it was delivered.
. But it would have to be a quite exceptionally bad fuel station for that.
I believe it is only the high octane fuels that are produced separately and to specific criteria. Everything else is generic.
So unless you're buying something like Optimax then it is all the same fuel from the same refineries.
One can only wonder why a myth perpetrates that supermarket fuel is somehow different but then you have to think what else the companies who sell the same fuel at a higher price might be doing PR wise other than just adding magical 'additives'
For OB fuel the basic rule is to try and swerve ethanol. Not such much because it is hydroscopic but because it is corrosive. But even then the most damage will be done if you leave the fuel sitting in the engine when not in use which is against best practice.
At the same time, if using a portable tank we have air vents on them that should be closed when not in use and that will keep the fuel fresh for a very long time.
Most people will run their engine dry and close their tank when not using their boat and this alone prevents almost all issues.
The one little thing that I suspect many don't do is to dispose of the petrol in the line. I wouldn't really want e10 sitting in there for 6 months.
Ultimately just use optimax or any fuel without ethanol but I wouldn't get overly concerned if you have to resort to an E10 fuel and I certainly wouldn't give a jot re brands as they all sell the exact same fuel from the same refineries.
But do remember that every time you buy a litre of E10 fuel, someone, somewhere is being denied a G&T.