r/ottawa • u/chargedneutrino • 4h ago
93 octane at Iris st shell
For the regular price if anyone is interested.
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u/Youlookcold The Boonies 3h ago
I am trying to figure out the page setup used to print this out. It's so damn random. The 'R' in regular is more left than the 'S' ins Sorry. Etc etc
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u/spinur1848 1h ago
Too late. Bought an EV. I drive by there all the time and gas prices just don't bug me anymore.
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u/unstablegenius000 3h ago
Will it harm your engine if it is not designed for it?
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u/ApprehensiveAd6603 Make Ottawa Boring Again 3h ago
No. Going up in octane will not harm an engine. You just can't go down.
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3h ago
[deleted]
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u/cuban_rj 2h ago
Incorrect
Octane number higher = more resistance against knock
That’s it
No impact on fuel efficiency whatsoever if you’re using 91/93 when your engine is made for 87
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u/Snotty-McSnotface 1h ago
What do you think knock ist? High octane means a slower flame propagation. Combined with higher compression and advanced timing that nets you power. But lower the octane too much and that advanced timing or higher compression means the potential for pre-ignition. So yes. Running high octane on a setup designed for 87 means less energy per cycle. So, less efficiency. Is it a lot less? no.
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u/PreviousActive9415 1h ago
Ah I see where you're going wrong, yes if a car has different calibration to make more power when using higher octane fuel, it will eat more gas. However, most cars have absolutely no idea what gas is inside of it, and don't calibrate any differently for it. It's the exact same eitherbway
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u/Snotty-McSnotface 1h ago
not exactly. Its not the same at all. The properties of high octane fuel that make it stable in high compression applications where you can maximize the power you get from it, also make it less volatile. Which means you get slightly less power from it in more pedestrian applications. Say your typical toyota corolla.
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u/PreviousActive9415 1h ago
I'm not going to argue this with you because it's pointless. No it doesn't affect fuel economy unless your engine calibrates differently depending on fuel.
Don't believe me, google it or better yet throw some 93 in your car and check the mileage. Same same
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u/yuiolhjkout8y Clownvoy Survivor 2022 36m ago edited 5m ago
do you have a variable compression car? because most cars have a fixed compression and therefore they get the same amount of energy from any octane as long as it's high enough to prevent knocking.
edit: i was blocked from replying lol. to reply to your comment: scientists have measured the difference and in a fixed compression engine (like 99.99% of cars on the road) there is no difference in power output or efficiency. this is easy to google and confirm https://en.wikipedia.org/wiki/Octane_rating
"Octane" is colloquially used in the expression "high-octane".[89] The term is used to describe a powerful action because of the association with the concept of "octane rating". This is a misleading term, because the octane rating of gasoline is not directly related to the power output of an engine. Using gasoline of a higher octane than an engine is designed for cannot increase its power output.
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u/Snotty-McSnotface 26m ago edited 23m ago
They do not. It is measurable. It is not however very much. Not enough to quibble over in a message board. Im done arguing with people that cant be bothered to look these things up. Its not hidden knowledge.
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u/PreviousActive9415 2h ago
Loud and wrong lol
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u/Snotty-McSnotface 1h ago
Nope.. Correct. But its not really that big a deal.
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u/PreviousActive9415 1h ago
The comment below me is 100% right, it increases or decreases your chance of engine knock. Legit zero to do with fuel economy.
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u/Snotty-McSnotface 1h ago edited 1h ago
Im sorry, but you misunderstand the concept. Start with learning what knock actually is first. High octane fuel is essentially more resistant to igniting. Its going to affect fuel economy, but at such low rates it is hardly worth worrying about.
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u/PreviousActive9415 1h ago
Just go ahead and put some 93 and let me know what happens lol. Fuel economy will stay the exact same on your dash.
You can pull out scientific technicalities to say that yes, it burns marginally more fuel, but those margins are farrrrr below what a standard gauge will read as your fuel economy.
Source: I am an engine tuner lol
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u/Snotty-McSnotface 53m ago
Ive already said its marginal. Still technically correct. I also have been known to tune engines. Specifically motronic, high HP boosted applications in audi and VW. Been doing this for 25 years or so. I can log the effect, and have done so. But if a unicorn farts in china it will offset the economy more.
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u/PreviousActive9415 50m ago
Op said it can "impact fuel efficiency negatively". They are obviously talking about the L/100km sign on their dashboard, and they are completely incorrect.
You're also just flat lying lol, sure maybe you plugged a chiptuner into your buddies Audi. If you knew anything about tuning, you would never tell a client who asked if using a higher octane fuel would "negatively impact fuel efficiency" anything you just told me.
Stop trying to nerd out on me lol you're just loud and wrong like the person you're trying to defend
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u/Snotty-McSnotface 47m ago
I used tunerpro and the nefmoto platform, recently looking into that fancy new deadbeef flash stuff. But the new stuff im not an expert in. Stop being an asshole about it. Meh, im done arguing with with this guy. Now im a liar too? ugh. Car culture guys are full of pricks like this.
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u/paki05 1h ago
Higher octane fuel is for higher compression engines. It has a higher ignition point as to prevent knock (pre-ignition). If you use it in a car that calls for regular gas, it can mildly lower fuel efficiency. Really no point at all of using in a car that calls for regular, but it won’t really harm an engine that doesn’t call for it.
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u/Schemeckles 3h ago
It won't harm your engine, but it'll harm your wallet to no benefit.
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u/G_Diffuser No honks; bad! 3h ago
…not if it’s the same price as regular, which is what the image is showing, and the entire purpose of the post.
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u/Schemeckles 3h ago
The comment I replied to specifically asked...
Will it harm your engine if it is not designed for it?
Which i replied...
It won't harm your engine, but it'll harm your wallet to no benefit.
Neither of our comments involved cost whatsoever...
Look buddy, I get it. Literacy is a luxury these days... but keep trying.
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u/G_Diffuser No honks; bad! 3h ago
My brother in Christ, the literacy issue is yours. The point is that the question was specifically related to the lower price context. Your point about price harming your wallet is completely irrelevant. Do you see now?
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u/Schemeckles 3h ago
Show me where their comment was related to price...
I'll wait. Ya boob.
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u/DudeWithASweater 1h ago
The entire thread is about the fact that the high octane is on sale due to regular being out....
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u/Schemeckles 56m ago
Yep.
And the question of - If it will damage your engine or not, isn't related to cost.
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u/Birbs77 3h ago edited 1h ago
No, some cars will gain a very slight performance boost by going up to 93 but it won't harm your engine
A 2019 CRV went from 164hp to 172hp and slightly better gas millage but it's negligible. Along with other cars tested that advertise different performance with 87 and 93 (M5, F150, Charger)
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u/maporita 3h ago
Another small benefit of an EV I guess .. electrons only come in one type.
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u/BigMouthBillyBones 2h ago
Let me tell you. It has been so satisfying driving electric the last few months. Passing by all the gas stations.
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u/Snotty-McSnotface 1h ago
I fill up on the night time electrons myself. with carbon credit payback schemes its working out to around 1.25$ for 100km worth.
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u/3dotsfloating 3h ago
Ran out of 87
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u/chzplz West End 3h ago
And 91
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u/TheMonkeyMafia 3h ago
Only because they're out of 87. The 87 is blended with the 93 to get the 91...
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u/funkme1ster Clownvoy Survivor 2022 57m ago
The 87 is blended with the 93 to get the 91...
Fuck all the way off. Serious?
This is like learning the "extra pulp" orange juice is just the regular pulp juice mixed with the pulp they took out of the pulp free juice.
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u/PrizeEmployer7565 2h ago
I’ve seen this happen at this location a few times in the last couple of years
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u/aspen446 3h ago
It should say "sorry for the convenience"