- Yes, but the eco warriors’ limited intelligence do not know this.
- Yes, and E fuels ARE higher octane thane fossil petrol, so for a correctly tuned motor, E fuels are a blessing…!
Except that as delivered from the pump E5 is usually 98/99 and E10 is 95 octane - and I’ve yet to see E85 on a UK or French forecourt.
Its quite prevelant around Tours, never used it and not sure why I would?
If the parts of engine are built to take it, concerns over rubber part degradation may or may not be true.
It’s one of those if you need it, you know you need it kind of things.
Typically highly tuned/remapped engines.
Yep it’s true. certainly vintage/classic from the “good old days”… 
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France is one of the highest users of E85 - it will be a small forecourt that does not have at least one E85 dispenser.
Outside of a pump or two around Silverstone and some other tracks, you will not find any in brexshitland due to british stupidity in building an E fuel distillery in Scotland before working out that transport of raw materials in and Efiel out far exceeded the RRP 
Do not, repeat, do not use E85 fuel in your car unless it has been especially mapped/tuned for the fuel or your car is manufactured to run with either or (usual indication of this is a yellow fuel filler cap)
So useless at maths here is a question.
E10 at 1;809e per litre, giving 7.7 per 100kms at moderate. E5 at 1926e giving 7.3 per 100 at moderate. Over 40litres, which is the better value?
If I understand your question, a car uses 7.7 litres to do 100km with E10 and 7.3 litres with E5 over the same distance.
To find the cost per 100km, you just multiply: 1,809 * 7,7=13,93
1,926 * 7,3=14,06
So E10 is better value (it will be the same answer whether it’s over 100km or 40 litres).
Thank you - it seems that the saving is 13 cents per 100km! Not a lot.
Same car.New ! Gorgeous to drive as I have a gammy left foot and the clutch was hell. Dacia Duster automatic. Unless the electronics are all up the spout the reading are correct. It is known that EIO is cheaper but you get less bangs for yourbucks if you understand me!
I can’t give you cast-iron figures but in my experience there are so many other factors that affect fuel economy (how you drive, state of the roads, tyre pressures, traffic, whether you are on autoroutes or back roads, the weather etc etc.) that I think it’s unlikely in practice that there will be much of an advantage either way.
I have filled up with both E5 and E10 in both my car and motorbike, and to be honest didn’t notice any obvious difference in either mileage or performance.
So now I generally just use supermarket E10!
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Its ok if your vehicle is designed to accept E10, mine runs a little rougher I believe but internals can be damaged if not using the improved materials for ethanol fuels long term.
Garden machines and old mopeds like my friends NSU the brass jet in the carburator dissolved due to galvanic corrosion. So end of the season drain out any fuel from garden machines.
Yes I think that has to be a given - and E10 doesn’t want to be left sitting about unused, as you mentioned, as it absorbs water more readily the more ethanol there is in the mix.
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Which basically all vaguely modern cars are.
However I’d suggest that if you have a high performance, high compression ratio, turbo charged or “tuned” engine you need a “high octane” fule for it to run well and, especially if tuned above the manufacturers original design power output, avoid damage to the engine.
Though AIUI the performance tuning market in France is essentially nonexistant.