E10 mpg?

B

Busterboo

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

They are lucky as you can buy 85% ethanol fuel out there :thumbsup:
 
pvr said:
:o E10 in a 35???
Click to expand...
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.
 
I've always used Sainsburys super unleaded. Did go Shell unleaded for a while, but costs more than Sainsburys super.
 
Busterboo said:
pvr said:
:o E10 in a 35???
Click to expand...
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.
Click to expand...

Could it perhaps be that you just needed new injectors, coil packs and plugs because you'd done 60k miles and nothing to do with the fuel?
 
tiglon said:
Busterboo said:
pvr said:
:o E10 in a 35???
Click to expand...
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.
Click to expand...
Could it perhaps be that you just needed new injectors, coil packs and plugs because you'd done 60k miles and nothing to do with the fuel?
Click to expand...
In the world of debate about V-Power, nah. Far too logical. :wink: Mind you, it did happen when I tried it. :?
 
Or you could say that the cheap fuel had knackered the whole system in that time which otherwise would not have happened 8)
 
Ethanol has a lower calorific value than gasoline so your gallon is now in effect less effective so its impossible to achieve more mpg on a lower calorific fuel. Ethanol is however 'greener' so it lowers your emissions per gallon which is the governments aim.
 
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