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      07-07-2013, 10:49 AM   #1
empilot
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E0 Fuel

Anyone out there been feeding ethanol free fuel to their S65? A new gas station has opened near me and offers ethanol free gas but it's a no-name gas station (not Shell, Exxon, etc). I'm going to try it out and I'm curious what some of those in the community thought about migrating away from BMW endorsed fuel vendors.

I'd also like to know if anyone has experienced any mileage or performance gains by switching to ethanol free fuel.

Thanks.
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      07-07-2013, 11:38 AM   #2
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Originally Posted by empilot View Post
Anyone out there been feeding ethanol free fuel to their S65? A new gas station has opened near me and offers ethanol free gas but it's a no-name gas station (not Shell, Exxon, etc). I'm going to try it out and I'm curious what some of those in the community thought about migrating away from BMW endorsed fuel vendors.

I'd also like to know if anyone has experienced any mileage or performance gains by switching to ethanol free fuel.

Thanks.
I run Spinx Ethanol free. Can't tell the difference to be honest. But I do it anyways because there's no Shell close to my house.
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      07-07-2013, 01:34 PM   #3
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The only benefit of E0 is fuel economy. E10 simply requires the ECU to spit out a bit more fuel to make its AFR targets correct but given the closed loop performance of the ECU (as with any modern car), it simply reads the AFR and adjusts by adding more fuel so power remains but costs a bit more fuel.

Not worth going out of your way but if it is available I would use it.

The problem with E10 which is pretty much everywhere is the 10 percent ethanol is already counted in the 91 octane. SO there is no benefit to pump E10.

I mix e85 to pump gas for the cooling effect and higher octane but given pump uses the 10 percent ethanol to contribute to its octane rating, there truly is no benefit of E10 pump to us. I would rather have 91 E0 and than you could add e85 for performance to bump octane from there but anyway you will save 1mpg on average with E0 over E10
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      07-07-2013, 02:30 PM   #4
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The problem with E10 which is pretty much everywhere is the 10 percent ethanol is already counted in the 91 octane. SO there is no benefit to pump E10.
This sentence lost me.


We had a Marathon station with E0 93 here but on my last trip over there last week it was changed to a Pure station and the E0 90, which they specifically labeled as mid-grade.

So now I'm back to going to Shell.
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      07-07-2013, 02:35 PM   #5
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Quote:
Originally Posted by 1fastdoc View Post
This sentence lost me.


We had a Marathon station with E0 93 here but on my last trip over there last week it was changed to a Pure station and the E0 90, which they specifically labeled as mid-grade.

So now I'm back to going to Shell.
He's saying the ethanol content increases the octane rating. So the gas starts life as something like E0 89 octane and then after the 10% ethanol is added, it becomes E10 91 octane.

For comparison sake, E85 is something like 110 octane equivalent but you can't run it (straight up) on your M3.
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      07-07-2013, 06:24 PM   #6
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Right LB. I am saying E0 gas 91 octane has other additives to make the octane 91. E10 91 octane has less of the other stuff and uses the ethanol which is high octane itself to make the 91.

I am saying I would rather take E0 91 octane and add 10 percent ethanol at 110 octane (or close) and that "e10" blend would be maybe 92.5 octane.

Point is there is no benefit to pump E10 other than the loss of fuel economy but the power is the same as E0.

So to answer in short E0 will save you a few bucks on gas but get no more performance as a modern ECU simply adapts for the E10 or above by adding more fuel to the mix to achieve the proper afr and thus the same power
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