we know that ethanol has a much higher octane rating than standard gasoline (130 I believe)I was wondering if gas stations simply add ethanol to regular old 87 which (I think) would bump its octane to around 89-90 or do they adjust other additives to compensate?
? about E10 and octane
- Thread starter brave sir robin
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since 87 is already supposed to include up to 10% ethanol, then they can't just add more ethanol to make 89 because then the 89 would have more than 10% ethanol.
I think they just use lower octane gas, and add ethanol to get the desired octane level.
Gas stations dont do anything - they can barely ring up a pack of cigs and a 12 bpack of PBR ...
My wife's uncle is an engineer for a well known oil company and refiner. I asked him exactly that, and he said that if the desired octane was 87, then they would start with 83 or 84 octane gasoline and add the required 10% ethanol to get it to 87.
Originally Posted By: brave sir robin
I was wondering if gas stations simply add ethanol to regular old 87 which (I think) would bump its octane to around 89-90
That's what they do in Iowa. The one ethanol blend is mid-grade 89 octane (87 octane gas with 10% ethanol added). The regular 87 octane and premium octanes are straight gas.
I was wondering if gas stations simply add ethanol to regular old 87 which (I think) would bump its octane to around 89-90
That's what they do in Iowa. The one ethanol blend is mid-grade 89 octane (87 octane gas with 10% ethanol added). The regular 87 octane and premium octanes are straight gas.
Straight gas? Where in the USA?
It has been castrated away.
Anyway, there are other additives that raise octane.
Ethanol is limited by the pump rating [10% or maybe 15%].
Once you are there, you can't add further.
It has been castrated away.
Anyway, there are other additives that raise octane.
Ethanol is limited by the pump rating [10% or maybe 15%].
Once you are there, you can't add further.
If the pump is labeled 87 octane, that is pretty much what you are getting. E10 in Minnesota is more or less 10% ethanol and the remainder is 85 octane gasoline. You can find rack prices here for 85 octane though you won't see it any gas station - purely for blending purposes.
Some states, like Iowa, midgrade @89 octane is generally cheaper by the gallon and is simply 87 octane gasoline blended with 10% ethanol.
Some states, like Iowa, midgrade @89 octane is generally cheaper by the gallon and is simply 87 octane gasoline blended with 10% ethanol.
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