E10 fuel consumption

[Deleted User 18472]

I managed to get confirmation from Daelim support, that my S3 Advance can happily run E10.
Still runs fine, and not noticed a drop in mpg.

[Drago]

I haven't noticed any drop in mpg on my SYM mask 125 (2019/Euro 4) either.

[MrGrumpy]

Nor me, on either Tmax or even the car!

[Data]

Yeah, I think what we are seeing here is pretty common place. Most folks don't experience any difference in fuel economy due to E10 and is what we found when we did testing about 10-11 years ago when it was introduced in the states. Worth repeating that when some engines switch to E10 there may be some slight drop in fuel economy because some engine designs (especially some older engines) don't like it quite so much. However, often this is not a big issue as after filling with E10 a few times, the extra cleaning action of the E10 cleans out the muck in these older engines and they start to perform more efficiently. In addition the bikes ECU's tend to trim ignition and fuelling settings to better accommodate any slight variance in burn efficiency to take better advantage of the E10 fuel. This can take at least two of three tankfuls or more depending on the bike or engine involved. This seems to offset the very slight drop in fuel economy of those engines and produces a better economy rate probably inline with or very near to your previous E5 petrol rate for most folks. So if you noticed a difference in economy (a slight drop) to start with, this will often be short lived.

Just wondering smeg about your figures on your HPE GTS. Unless you've become a throttle maniac overnight, why are you getting seemingly much less mpg than you normally do? I've check around with one or two folks I know with the HPE and they have been checking their fuel economy on E10 and again haven't noticed any difference that is easily measurable. They have been using the brim to brim method to get the best accuracy. All getting really good economy and slightly better than me. That's not surprising as the euro 5 is a bit more economical than my euro 3 bike. What method are you using each time to calculate your figures, if you don't mind me asking? Brimming and then Miles divided by Gallons? (4.54litres to the Gallon). You seem to be consistent with whatever method you are using. Also, how many miles has your bike covered. If it's low miles the motor is still con forming and still won't be at it's most efficient, but should be giving at least somewhere near it's previous figures (for last year at this time on E5). I'd love to check your bike over just to be sure there is nothing amiss like a loose connection to the IAT (induction air temperature sensor) or some other equally important sensor. The IAT has been know to malfunction and send the mpg's off a bit. But I suspect that's unlikely.

[Davefirestorm]

My experience is that E10 makes no difference to fuel economy on any of my bikes one is a late 90s Honda with 6 carbs and bit concerned E10 might cause issues but I’ve been able to ride it often due to good weather up till now I understand all Hondas built after 1993 can cope with Ethanol,we’ll see

[derekg]

To add to the discussion
Have not noticed any fuel mileage difference on my 2014 Honda NSS300 Forza but only a few miles done recently....so not really tested.
However on my Hyundai Tuscon 2019 which I have had from new and now with 10000 mls on the clock when starting to use the new E10 I first noticed a change in engine acceleration performance..stuttering when accelerating hard....bit like one of the spark plugs was misfiring...so I tried putting in the high grade (more expensive) Shell E5 and the car has immediately returned to running perfectly as it did before. And while I have not carried out an accurate miles per gallon test the Tuscon on board system using E5 showed around 32MPG ( UK) that dropped to around 25MPG with the E10...and with the Shell high grade E5 it is back to 32/33 Mpg....and I appreciate its only as from the Cars measuring system so not necessarily accurate for all 3 readings.
None of this "proves" anything but does appear to point at an issue with E10 on the Tuscon?
I intend to ask at my Hyundai garage when next passing.
As I say....just to add to the discussion.

[Data]

That's definitely not an E10 thing derekg. E10 might cause some rough running if the engine concerned is a very dirty one or the fuel system is a bit claggy. But only to start with. E10 tends to clean out rubbish and carbon/gum that might cause it to run rough in some circumstances. But it won't affect your economy so much. Wondering if you took on extra water with your fuel which caused rough running. If the garage tank was very low that can happen or if the garage had just stirred the tanks there could be water in the fuel. At least it's running ok now.

[mottza]

My Tuscon is doing the same. But have not tried E5, given its 1.65/lire here. I have tried using Shell rather than tesco. That gave a higher mpg.

[derekg]

I agree Mottza...shell stuff is very expensive...could be worth your while giving it a try for a tank just to see?...but a golf pal of mine who had been a mechanic suggested I try it just to see and what I describe was the result...
and thanks for the input Data. You will be correct I have no doubt as I am no mechanic etc......but my experience is that prior to using the E10 the car ran like a bird on normal E5...great acceleration on E5 fuel but when inputting the first tank of E10 the engine started stuttering which continued with many further tanks of E10 but which immediately stopped when trying the Shell E5...it was really noticeable... ....and with the seeming return to the previous MPG ....I love my Tuscon ...its just a great car ...but the MPG with E10 is really poor it seems on my car....but as you say it could well be other reasons...will see what the dealer says...if there is any issue then presumably the dealer will have others saying similar?

[derekg]

and I appreciate this is a maxi scooter forum and not a Tuscon forum so dont want to overplay a comment here...thanks...