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Originally Posted by Adam Ef
I understand that but how does it relate to octane? Why is E5 now called premium when it used to be normal?... is it still higher octane or does that relate directly to the ethanol content?
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I've read that ethanol actually boosts octane to achieve the minimum 87 rating required. The 'bang for buck' loss is aimed at the projected increase in E5 fuel ... average £15 extra for a 55 litre tank.!!