91 octane gas only? - Alfa Romeo Stelvio Forum
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post #1 of 38 (permalink) Old 02-20-2019, 03:08 PM Thread Starter
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91 octane gas only?

Have you guys attempted to put 87 or 89? Just curious what would happen. Thanks
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post #2 of 38 (permalink) Old 02-20-2019, 04:05 PM
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I always shoot for 93 octane. I wish I could find some with no ethanol. I've thought about racing fuel but haven't researched it.
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post #3 of 38 (permalink) Old 02-20-2019, 06:12 PM
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I have put in regular 87 on a couple occasions when I just couldn't stomach the price of gas in LA (it is about $.60 a gallon more expensive than where I live)..to be honest haven't really noticed a difference. Also haven't driven it hard or for fun, just point A to point B with 87.


There are various sensors that will notice the difference and retard the timing to keep the engine from running poorly. It will drop HP and torque some, but again, after doing it a couple times I never noticed a difference in normal driving.


I will add though that there is more to octane in gas levels and the higher priced, higher octane gas also generally has more cleaners in it making it better for your engine overall. As such premium is better gas and I is what I put in (and suggest others do also) 99.9% of the time, BUT if you gotta put in 87 you aren't going to hurt anything.
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post #4 of 38 (permalink) Old 02-20-2019, 07:47 PM Thread Starter
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Thanks for your input! I’ve heard of people doing 87 and then the 3rd fill up with 91.
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post #5 of 38 (permalink) Old 02-20-2019, 07:47 PM
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Quote:
Originally Posted by ALFAOFFROAD View Post
I have put in regular 87 on a couple occasions when I just couldn't stomach the price of gas in LA (it is about $.60 a gallon more expensive than where I live)..to be honest haven't really noticed a difference. Also haven't driven it hard or for fun, just point A to point B with 87.


There are various sensors that will notice the difference and retard the timing to keep the engine from running poorly. It will drop HP and torque some, but again, after doing it a couple times I never noticed a difference in normal driving.


I will add though that there is more to octane in gas levels and the higher priced, higher octane gas also generally has more cleaners in it making it better for your engine overall. As such premium is better gas and I is what I put in (and suggest others do also) 99.9% of the time, BUT if you gotta put in 87 you aren't going to hurt anything.
Was a recent shortage of Premium unleaded and all the stations in my area only had 87.

Did one fill and noticed a distinct issue with acceleration after initial start. While the engine was still cold, it would take a long time for the car to get going under normal driving conditions (AKA not standing on the gas). Took two tanks of 91 to get the performance back in line with cold starts.
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post #6 of 38 (permalink) Old 02-20-2019, 08:18 PM
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Originally Posted by Zatara View Post
Was a recent shortage of Premium unleaded and all the stations in my area only had 87.

Did one fill and noticed a distinct issue with acceleration after initial start. While the engine was still cold, it would take a long time for the car to get going under normal driving conditions (AKA not standing on the gas). Took two tanks of 91 to get the performance back in line with cold starts.

Ummm...I am physically incapable of not standing on the gas...…so didn't realize that.


Seriously.


Also, where are you and were the stations possibly mixing in more ethanol or something to try and get the gas to last on their end? During a fuel shortage it is very common for gas stations to "water down" the gas, could be that was affecting more than the octane. I'de be interested if the results were the same when there is not a shortage. (Gas is delivered to regions via pipeline to storage facilities, the various octanes and other brand specific additives are added at the storage facility. Afterwards it is loaded into the tanker trucks for delivery to specific stations. Often during fuel shortages the storage/mixing facilities will only make 87 grade and CAN add more ethanol or other additives in to make the supply stretch.)

That it took 2 fills to fix the issue also makes me wonder if those tanks at the gas station weren't getting low...it is very common that gas storage tanks get a layer of crud on the bottom that can get into your tank when the station lets the levels get low that can plug up fuel filters and injectors. If the tanks at the storage facility AND the station were both low...that only compounds the problem with crud getting into the fuel. Issues like that are really only noticeable during initial acceleration when the fuel pump is not pushing high pressures...until they get REALLY bad , which only happens through long term exposure so don't worry about that. If it did happen though, that you got a good amount of crud in your fuel, it would definitely take a tank or two for the build up to get washed out. (Close friend of the family owned a Union 76 station while I was growing up. Used to listen to my Dad and their Dad talk "shop")


Another thing to realize is the further away from sealevel you are the less tendency the engine has to create knock (the reason we have high octane), so the less need there is for higher octane gasoline. I live at 2500ft, although like I said it didn't make a difference in LA at sea level that I noticed...but there is no acceleration in LA, just get in line and move a few feet forward every couple minutes...

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Last edited by ALFAOFFROAD; 02-20-2019 at 08:33 PM.
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post #7 of 38 (permalink) Old 02-21-2019, 06:32 AM
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Staying with just the high octane premium gasoline topic, I used to put in my X3 premium 'generic' brand. For the Stelvio, I am putting slightly more expensive high octane 'brand' gasoline, such as Shell, Exxon-Mobil, BP, etc. Supposedly because of the additives make this gasoline 'better'. Is this marketing hype or is the brand name gasoline really better. Cheers.

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post #8 of 38 (permalink) Old 02-21-2019, 09:44 AM
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You all should think yourselves lucky ;-)

We can only get 95 octane minimum in the UK, and it costs $6/US gallon....
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post #9 of 38 (permalink) Old 02-21-2019, 10:27 AM
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They love to tax you guys in Europe the Gas and the VAT are killers.

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post #10 of 38 (permalink) Old 02-21-2019, 10:49 AM
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Power will drop quite a bit on regular and everything will be retarded. Mileage will also drop as I have seen the on multiple other cars over the years. Just gas up at Costco as its a tier 1 product and your premium will be cost of Reg on the street. You bought a performance vehicle right?????? Pass on the Starbucks and feed the car what it wants.
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