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Discussion Starter · #1 ·
From September regular petrol supplied in the UK will change from the E5 to E10 formulation having a 10% bio-ethanol content. How much do people expect the fuel efficiency of the high compression SkyActiv G petrol engine I have to be affected by this change in petrol formulation?
 

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My comment is pretty much useless I guess, but anyway. When I first got the car I used E10, I changed a few months later to E5 (we can choose :)) because supposedly it is 'better' for the engine. I found the engine to be somewhat rough at times, I was hoping this would solve it. Engine is running the same, no increase/decrease in fuel economy. I'm not sure if I felt any change in performance (E5 should give a bit more power?). All in all I did not win nor lose anything (aside from the slightly higher fuel price) ;-).
 

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Discussion Starter · #3 ·
My comment is pretty much useless I guess, but anyway. When I first got the car I used E10, I changed a few months later to E5 (we can choose :)) because supposedly it is 'better' for the engine. I found the engine to be somewhat rough at times, I was hoping this would solve it. Engine is running the same, no increase/decrease in fuel economy. I'm not sure if I felt any change in performance (E5 should give a bit more power?). All in all I did not win nor lose anything (aside from the slightly higher fuel price) ;-).
Did you mean the engine was rougher using E5 or E10?
 
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So no noticeable difference between E5 and E10, still 'rough' running at times and a bit jolty/jerky (during acceleration for example), so using E5 did not fix the 'issue' I'm having :).
 

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Discussion Starter · #5 ·
So no noticeable difference between E5 and E10, still 'rough' running at times and a bit jolty/jerky (during acceleration for example), so using E5 did not fix the 'issue' I'm having :).
I have no rough running on my 2.0 SkyActiv G other than the initial 1 minute warm up period.
 

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So no noticeable difference between E5 and E10, still 'rough' running at times and a bit jolty/jerky (during acceleration for example), so using E5 did not fix the 'issue' I'm having :).
That's one of my few criticisms of the 3, it's a bit jerky at times. I've been meaning to see if ethanol free from Shell or the like helps with that. Anyone do any tests?
 

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Not able to here since it's all E10 but I'm going to throw a guess out there at it being due to the emissions systems. Emissions is why we have Rev hang with the manual and that can definitely contribute.
 

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My e skyactiv x is definitely worse on fuel since E10 came out, on an identical run of 90 miles on the motorway which with E5 gave me a best figure of 61.4 mpg with E10 that dropped to 58.6 not a great difference but still nearly 5% which I suppose you would expect, is E10 the same 95RON? with a compression ratio of 15 to 1 I would expect it to be more affected than normal petrol engines, it definitely seems to pink a bit now under load.
 
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