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Originally Posted by 20vcqdriver
E10 is supposedly not as efficient (if that's the right word) so some power loss and not as good mpg. Anyone confirm if this is actually the case?
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A long time ago and a very different engine to our Audis but my first ever car, a 1947 Series E Morris 8, always ran noticeably better with Cleveland Discol fuel which contained ethanol at an unknown level. Cleveland was absorbed into Esso and the sites re-branded in the 1970's; Discol also disappeared.
The big potential problem with ethanol in petrol is that it will absorb moisture whereas petrol on its own doesn't. That water/ethanol mixture can turn acidic and may accelerate corrosion problems with brass and steel fittings so the best bet is to prevent water getting into the fuel system. That's difficult in a climate such as ours but it's the only answer really.