Where to find 93 octane in Denver?

[rkl303]

Title says it all. I remember the farmer's milk store or whatever its name is on Zuni and Mississippi used to carry some, but I don't remember seeing it anymore there.

 

Any where else I can find some of that gas?

[chenc544]

It's easier to find some 100 oct gas and just mix them with 91. There are few stations in Metro area that carries 100 oct. The only one that I can remember off top of my head is on Santa Fe a couple of miles south of Titan road. I think there is a website out there that lists them too...

[jmanzs]

There is a gas station at Parker and Quincy that sells 93

[Cliff]

There is a gas station at Parker and Quincy that sells 93

 

 

It's called "Petro Stop" and thankfully not too far from where I live.

[bennetb01]

Sinclair at Bellview and I-25

[rkl303]

Any bod y notice the differenc e between 91 and 93 map?

[Vimy101]

Once again, the "octane" myth raises its ugly head. There is less air and therefore oxygen at altitude and therefore less chance for knock. "Octane" is just a catch all term for knock resistance. Premium 87 (or whatever it is) at altitude will perform the same as 93 in Illinois. Here on prairie we have had ethanol for a long time. Ethanol has less energy and less tendency to create knock so the "octane" rating goes up.

[SSpeed]

There is a gas station at Parker and Quincy that sells 93

 

I don't know, that 93 octane is a whole lot of ethanol... when I ran it my fuel trims went super crazy.... ethanol has less combustiable power than regular gasoline and a lower stoich value, while it may have higher octane, you'll need more of it (more injector) to produce the same power...

[Vimy101]

^ Ethanol doesn't have more "octane". It raises AKI because the damn stuff doesn't want to burn as readily as straight gas.

 

Maximum alcohol content at the pump shouldn't exceed 10% unless it's the E85 stuff.

[BWD]

It's called "Petro Stop" and thankfully not too far from where I live.

 

Sinclair at Bellview and I-25

 

FYI guys, both of these are closed down now.

[SSpeed]

^ Ethanol doesn't have more "octane". It raises AKI because the damn stuff doesn't want to burn as readily as straight gas.

 

Maximum alcohol content at the pump shouldn't exceed 10% unless it's the E85 stuff.

 

Ethanol has much greater octane than normal gasoline, what do you base your answer upon? That's how Petro Stop was able to raise the octane to 93, a higher content of ethanol.

 

Check out the energy content section here:

http://en.wikipedia.org/wiki/Gasoline

 

E85 has an octane rating of over 100 due to it's ethanol content.... octane content is only part of the equation though, ethanol has a lower stoich value and less combustiable power... that's why using 93 octane gas that is a whole lot of ethanol isn't necessarily better than using 91 octane gas that doesn't have a high ethanol content...

[Vimy101]

^ Alcohol does not have any "octane". There is an -OH hydroxyl group on the ethanol molecule that makes it less combustible. This is what raises its AKI and what is often erroneously refered to as "octane".

 

Fuel standards are set to a max 10% alcohol in pump "gasoline". Maybe those stations were forced out of business by exceeding the mandated limits.

[SSpeed]

^ Alcohol does not have any "octane". There is an -OH hydroxyl group on the ethanol molecule that makes it less combustible. This is what raises its AKI and what is often erroneously refered to as "octane".

 

Fuel standards are set to a max 10% alcohol in pump "gasoline". Maybe those stations were forced out of business by exceeding the mandated limits.

 

Is the Wiki article incorrect?

[Vimy101]

^ I didn't/haven't read the Wiki article. I'm going off my basic university chemistry. The -OH group hinders the exothermic reaction.

[SSpeed]

^ I didn't/haven't read the Wiki article. I'm going off my basic university chemistry. The -OH group hinders the exothermic reaction.

 

But the basic jist is, a higher octane premium fuel is going to have more combustible energy than a fuel with the octane rating raised with ethanol. So, just because a fuel is rated at 93 (due to high ethanol content) doesn't mean it's going to give you more tuned power than a mostly pure 91 octane rated fuel.

 

And my statement was, the Petro Stop had a high ethanol content, threw off fuel trims, and I actually made less power tuning accordingly on that 93 over normal premium 91... my injector duty cycles were also higher...

[Vimy101]

^ "Octane" is a misnomer. Anti Knock Index (AKI) is the correct term.

[ParkerGTL]

rkl303:

 

Since no one has given you an answer where to buy 93 octane in Denver, just their opinion on octane ratings, (be careful taking advise from some one who lives at a few hundred feet above sea level) you can still get it at Englewood Self-Serve on Broadway and Eastman. Their 93 octane is achieved by mixing in more Toluene from what I understand not ethanol at the refinery.

 

I hope you have your car tuned to take advanage of the extra octane or you won't notice much of a difference. Both of our GTL and STi or tuned for 93 octane and we get the extra punch in both.

 

We have been mixing 91 octane and E85 at .85:.15 ratio and have had very good luck with this mixture. Makes traveling much easier and not having to change maps in 91 octane areas only.

 

Petro Stop has been out of business for almost two years!

 

Parker

[Vimy101]

We have been mixing 91 octane and E85 at .85:.15 ratio and have had very good luck with this mixture. Parker

 

What kind of good luck?

 

Ballpark, you're running about 20% ethanol, right? What's your mpg?

[ParkerGTL]

Vinny:

 

In the GTL 18mpg in the city all the time and up to 29mpg highway. The STi always 17-18mpg but have never had it on a highway trip.

 

GTL on a Dynojet at 5800 feet registered 183HP/205lb/ft uncorrected.

 

My wife likes to drive it hard so this isn't easy on the throttle driving.

 

Knowing what I know now, wish I would have gotten a GT rather than the STi.

 

As for total percentage of ethanol, it is somewhere between 15% and 25%, depending on the time of year. Winter has 10% ethanol in gas, Summer is just straight gas no ethanol (or so they claim it is).

 

The GTL shows about 1625 for EGTs under WOT on longer pulls!

 

Parker

[Vimy101]

^ I presumed you were talking about LGT performance. The Sti and the LGT are different cars. How does your Sti mileage compare to other Stis?

[mwiener2]

Once again, the "octane" myth raises its ugly head. There is less air and therefore oxygen at altitude and therefore less chance for knock. "Octane" is just a catch all term for knock resistance. Premium 87 (or whatever it is) at altitude will perform the same as 93 in Illinois. Here on prairie we have had ethanol for a long time. Ethanol has less energy and less tendency to create knock so the "octane" rating goes up.

 

 

You are so off on this Mr. Chem major

[Vimy101]

^ Oh really? How so? I guess the oil industry and myself really don't know anything.

 

I suppose I was under the wrong impression that atmospheric density decreases with altitude. Likewise the BTUs available from alcohol are greater than from straight gasoline.

[mwiener2]

Available BTUS from greater to least are Diesel > Gasoline > E85

 

Octane is a term refering to the knock index when used in the car world, not the amount of Octane in the fuel itself.

 

Turbo cars are unaffected by the altitude in relation to quality of gas. 87 grade gas does NOT perform the same at altitude as 91 in a turbo car. NA cars are a different story.

 

E85 has an Octane rating of 105-113

[Vimy101]

Available BTUS from greater to least are Diesel > Gasoline > E85

 

Octane is a term refering to the knock index when used in the car world, not the amount of Octane in the fuel itself.

 

Turbo cars are unaffected by the altitude in relation to quality of gas. 87 grade gas does NOT perform the same at altitude as 91 in a turbo car. NA cars are a different story.

 

E85 has an Octane rating of 105-113

 

Point one, I agree. Alcohol has the fewest BTU.

 

Two, I agree. Octane is an actual petroleum derived hydrocarbon. The common useage of "octane" now refers to AKI.

 

Three, I was refering to the premium grade fuel generally available in your area which you have confirmed to have a 91 AKI. And yes, atmosphereic density is less at altitude.

 

Now, where was I mistaken? Confusion of terms?

 

BTW, E85 has an AKI of 105-113. I thought its AKI was high but not that high.

[mwiener2]

Premium 87 (or whatever it is) at altitude will perform the same as 93 in Illinois.