Found this on the web.
Might be an easier solution for all.
It’s worth remembering that E10 is not the only option. E5 is likely to remain on UK forecourts for another five years, but even better for owners of historic cars could be investigating ethanol-free fuels. At the time of writing, there is no requirement for ethanol to be included in super unleaded (97/99) grade petrol, so if you’re driving a cherished older vehicle (or putting one into long term car storage), consider a switch to the UK’s only ethanol-free fuels, Esso Synergy Supreme+ Unleaded 97 and Synergy Supreme+ 99. Taking a long-term view, we’d advise that any car with fuel held in the tank for over three years should be drained and replaced with ethanol-free petrol.
What’s in our Synergy Supreme+99 premium petrol
Our Synergy Supreme+ 99 petrol has more cleaning power than our regular petrol – and includes molecules whose job it is to reduce the friction in your engine helping the moving parts work more efficiently.*
Although our pumps have E5 labels on them, our Synergy Supreme+ 99 is actually ethanol free (except, due to technical supply reasons, in Devon, Cornwall, North Wales, North England and Scotland). Legislation requires us to place these E5 labels on pumps that dispense unleaded petrol with ‘up to 5% ethanol’, including those that contain no ethanol, which is why we display them on our Synergy Supreme+ 99 pumps.
There’s currently no requirement for renewable fuel, like ethanol, to be present in super unleaded petrol although this could change in the future, in which case we would comply with any new legislation.
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