E10 mpg?

Busterboo · Post by **Busterboo** » Sat Aug 21, 2021 10:03 am

My 35iS use is quite consistent. About 1,000 miles a month. Most journeys under 25 or 100 miles. Few more. Food shopping, shooting and driving for fun.

So, mpg over 60,000 miles in 58 months has been equally consistent and predictable. However, recent use of E10 seems to have improved it. By about 4%.

Deepseaskateboard · Post by **Deepseaskateboard** » Mon Aug 23, 2021 3:23 pm

Have you noticed any performance increase?

brillomaster · Post by **brillomaster** » Mon Aug 23, 2021 4:15 pm

is that 4% better than an equivalent mpg in august? and you are sure your usage patterns haven't changed?

unfortunately mpg has so many variables (weather conditions, condition of car/tyres, length of journeys, even mood of driver) that seeing a 4% gain by using E10 probably isnt statistically significant.

fredej · Post by **fredej** » Mon Aug 23, 2021 4:52 pm

The energy density of ethanol is lower than gasoline. So if anything, I would expect slightly higher fuel consumption with E10 compared to E5.
The octane number should be the same for both E10 and E5.

Busterboo · Post by **Busterboo** » Tue Aug 24, 2021 11:01 am

Deepseaskateboard wrote: ↑Mon Aug 23, 2021 3:23 pm Have you noticed any performance increase?

Neither increase nor decrease and I have no (easy) way of measuring it.

Busterboo · Post by **Busterboo** » Tue Aug 24, 2021 11:10 am

Deepseaskateboard wrote: ↑Mon Aug 23, 2021 3:23 pm Have you noticed any performance increase?

Neither increase nor decrease and I have no easy way of measuring it. The average mpg, however, is displayed all the time.

romainh · Post by **romainh** » Mon Nov 15, 2021 10:54 pm

I have noticed a slightly overconsumption since the switch on mine (sdrive23i), while I used to average just over 30mpg+ before the switch it is now just under for the driving conditions and no other changes. No apparent change to the performance though

tiglon · Post by **tiglon** » Tue Nov 16, 2021 7:03 pm

I've noticed no difference at all in my Focus, which is perhaps a more reliable test because it's a 1.0 so the throttle is always 100% open...

I don't use regular fuel in my Z4 for no reason other than the premium stuff makes me feel special.

pvr · Post by **pvr** » Tue Nov 16, 2021 8:30 pm

E10 in a 35???

Jollyjoiner · Post by **Jollyjoiner** » Tue Nov 16, 2021 8:36 pm

pvr wrote: ↑Tue Nov 16, 2021 8:30 pm E10 in a 35???

B21 · Post by **B21** » Tue Nov 16, 2021 8:39 pm

pvr wrote: ↑Tue Nov 16, 2021 8:30 pm E10 in a 35???

What’s the issue?

Nanu · Post by **Nanu** » Tue Nov 16, 2021 8:57 pm

Jollyjoiner wrote: ↑Tue Nov 16, 2021 8:36 pm
pvr wrote: ↑Tue Nov 16, 2021 8:30 pm E10 in a 35???

BMW say no issues with E10 although the price has increased and I don't suspect it's all to do with supply and demand.

B21 · Post by **B21** » Tue Nov 16, 2021 10:40 pm

US fuels have had at least 10% ethanol for many years…

They are lucky as you can buy 85% ethanol fuel out there

Busterboo · Post by **Busterboo** » Wed Nov 17, 2021 1:18 am

pvr wrote: ↑Tue Nov 16, 2021 8:30 pm E10 in a 35???

After 60k miles in my 35iS on good ole 95 RON, tried that highfalutin V-Power and had to have new injectors, coil packs & plugs. Happy to be on E10 now, running smooth as silk.

flybobbie · Post by **flybobbie** » Wed Nov 17, 2021 8:24 am

I've always used Sainsburys super unleaded. Did go Shell unleaded for a while, but costs more than Sainsburys super.

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