91 octane gas only? - Page 2 - Alfa Romeo Stelvio Forum
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post #11 of 30 (permalink) Old 02-21-2019, 11:49 AM
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Originally Posted by ALFAOFFROAD View Post
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...
HA! Well...I am in LA.

Good points on the crud that may have been pumped into the tank. On a side note, the gas stations in my neighborhood still do not have 89 or 91 octane gas. It is not limited to just 1-2 it is all of them. I have had to fill up near my office 20 mi away in order to get premium. It is very strange.
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post #12 of 30 (permalink) Old 02-21-2019, 02:33 PM
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I've been using 93 Octane from Costco. It is certified Top Tier rated gasoline. Also, why get 91 Octane at some brand name station, (Exxon, Shell, Chevron, Texaco, all of these of course are also Top Tier gas), when you can get 93 Octane at Costco for the same price!

Cheers!
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post #13 of 30 (permalink) Old 03-01-2019, 08:20 PM Thread Starter
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Just an update. I will be using 91 exclusively. Tried 89 and the car felt terrible. A lag when my foot is off the brake to gas.
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post #14 of 30 (permalink) Old 03-01-2019, 08:56 PM
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91 is hard to find here in the NYC area. Was putting in 93 but tried a tankful of 89. Can definitely tell the difference - more sluggish, especially on takeoff. Going back to 93 only.
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post #15 of 30 (permalink) Old 03-04-2019, 10:49 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.
I work in the gasoline trading business. Think boats moving from refineries across the world, moving on pipelines...etc. 99% of all the gasoline you put in your car is exactly the same. It exchanges hands so many time, Equnior's product will become Exxon's product which will become Shell's product which then will become BP's product which then will become a trader's product which then will be put into a tank farm which all the gas station in the local area will load their local tanks from. IF it's bad gas (which does happen on occasion) it's not the 'brand' that has bad product, it's likely the local owner who's watered down the product to maximize his profits. Moral of the store is all the gas your buying is coming from the same refinery, is blended by the same people, and shipped & delivered by the same people. The non branded fuel 99% of the time is coming from the exact same tanks the branded product is coming from. Now the real question is do you trust the owner of your station to not water down the gas?
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post #16 of 30 (permalink) Old 03-04-2019, 12:03 PM
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Marwan Costco in NY do not sell Gasoline, on Long Island anyway.

Paul G Long island
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post #17 of 30 (permalink) Old 03-04-2019, 03:04 PM
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Originally Posted by Texas_Stelvio View Post
I work in the gasoline trading business. Think boats moving from refineries across the world, moving on pipelines...etc. 99% of all the gasoline you put in your car is exactly the same. It exchanges hands so many time, Equnior's product will become Exxon's product which will become Shell's product which then will become BP's product which then will become a trader's product which then will be put into a tank farm which all the gas station in the local area will load their local tanks from. IF it's bad gas (which does happen on occasion) it's not the 'brand' that has bad product, it's likely the local owner who's watered down the product to maximize his profits. Moral of the store is all the gas your buying is coming from the same refinery, is blended by the same people, and shipped & delivered by the same people. The non branded fuel 99% of the time is coming from the exact same tanks the branded product is coming from. Now the real question is do you trust the owner of your station to not water down the gas?

Always thought the only difference, besides budget leaky tanks, was what was added prior to delivery ie proprietary additive that are different in a Shell v a Mobil product for example. Octane, by law, is definitely different unless the crooked stations play with the blends beween 87 & 89. 89 is the total waste of space on a pump.

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post #18 of 30 (permalink) Old 03-04-2019, 03:14 PM
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What about octane boosters....any value over 91?
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post #19 of 30 (permalink) Old 03-04-2019, 04:36 PM
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Thanks @Texas_Stelvio . You confirmed what I suspected. Distribution of gasoline to retail stations is king. Many times I see the distribution tanker-trucks at a gas station and the truck is either nameless or a company name nothing to do with the gas station brand.

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post #20 of 30 (permalink) Old 03-04-2019, 05:12 PM
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Originally Posted by ViscontiVerde 164L* View Post
Always thought the only difference, besides budget leaky tanks, was what was added prior to delivery ie proprietary additive that are different in a Shell v a Mobil product for example. Octane, by law, is definitely different unless the crooked stations play with the blends beween 87 & 89. 89 is the total waste of space on a pump.
You're spot on there, and/but the amount of additives is negligible at the end of the day and typically added into the storage tanks at the individual stations. Most trucks are all being pulled from the same storage 'racks'.

More so, I'd be interested in seeing which stations actually change RVP grades properly (basically gasoline pressure, lower in the hot summer months / higher in the colder winter months to allow for proper expansion/combustion). Around these changes (which are happening next week) I'd be more keen to buy from stations that are turning more volume to make sure they're actually selling gas with the proper rvp. Long story short, if there are going to be quality issues, it will be in the coming weeks and similarly in the fall when we change back to winter grade gasoline.
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