Originally Posted by
kevkdg
Thanks for all the replies.
Does the likes of "super unleaded" as opposed to standard unleaded generally contain less ethanol?
For a while after 5% ethanol was added to all standard unleaded in Scotland, I found that super unleaded from eg. Esso did not contain any alcohol and was soon approved by the LAA in aeroplanes permitted to use unleaded petrol. However, a couple of years ago 5% ethanol appeared in super unleaded too, at least in the west of Scotland. I presume it is now the same in most of the UK which is why, with certain precautions and in certain engines, use of standard unleaded with 5% ethanol can now be approved in LAA aircraft. Strangely, however microlights with the same engines and similar or identical fuel systems were permitted to use unleaded petrol containing ethanol throughout.