I have a plastic Acerbis tank on my CCM which has had regular unleaded in it for years continuously up to and including today and it's not changed its dimensions as far as I can tell. The seat still fits and all the mounting holes still line up.
How much ethanol is in UK 95 octane fuel at the moment I've no idea but I don't pick and choose any brand, just use whatever turns up when I run out.
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