I'm gonna start putting regular into the AMG. Marketplace video

[01RedDX]

.

[HiSpec]

I recall being Calgary is at such high elevation, it can go one octane grade lower.

[schocker]

Originally posted by HiSpec
I recall being Calgary is at such high elevation, it can go one octane grade lower.

That doesn't mean to switch from 91 to 89 though, when you go lower it switches from 87/89/91 to 89/91/93.

[blairtruck]

Originally posted by flipstah
I stopped watching after seeing the yoga instructor.

well you missed at around 13 min where she kissed a tree and ate a petal from a flower.

[Tik-Tok]

Originally posted by schocker

That doesn't mean to switch from 91 to 89 though, when you go lower it switches from 87/89/91 to 89/91/93.

There's lots of 87 on the coast. And yes it does mean you can switch from 91 to 89 on a non forced induction vehicle.

[g-m]

Originally posted by 01RedDX
OK but honestly, is there a quantifiable difference, in a modern NA engine, in Calgary, between 89 or higher octane?

if you tune it more aggressively you could definitely make more power. Spark advance and lean it out a bit

[Maxx Mazda]

Octane makes a huge difference if you're tuned for it. I have my car dual mapped. One "street" map for 94 octane and one for 100octane leaded fuel (AvGas). On a stock vehicle, you probably won't notice any difference. However on my Ecoboost F-150, if I run 93 I get much better performance and gas mileage although it doesn't "mandate" premium the manual says "for best performance". I've used my scan tool to pull realtime data and on regular it pulls timing like crazy. This is well documented on Ford forums as well.

[revelations]

Originally posted by HiSpec
I recall being Calgary is at such high elevation, it can go one octane grade lower.

I recall this too, but thought it was applicable to NA engines only.

[codetrap]

.

[Neil4Speed]

I've tested time and time again, The cost difference between premium/regular is made up in my car with more mileage.

[Maxx Mazda]

Originally posted by codetrap
Max Mazda, enough to offset the cost with the ecoboost?

In my experience, yes. I have the 136L tank.

[schocker]

Originally posted by Tik-Tok
There's lots of 87 on the coast. And yes it does mean you can switch from 91 to 89 on a non forced induction vehicle.

Now I am more confused, I just based it on driving places I have been in the US. I know my manual says use 91 and only 87 temporarily which results in decreased performance. I can then run 89 at lower elevations?

If premium unleaded gasoline with a PON of 91 or higher is
not available, you can temporarily use the gasoline with a PON
of 87 or higher.
This will result in decreased engine performance, and can
cause occasional metallic knocking noise in the engine.

[Mibz]

If your car is fuel injected and uses coil-based ignition then you can run 87 all day everyday and it won't harm your car. All relatively modern cars will detect knock and immediately pull timing to prevent damage.

The altitude thing is based on the opposite also being true. Your car will not detect a lack of detonation and keep increasing timing until it does. This means that, at high altitudes, your NA car will likely make near full power on 89 octane instead of 91 because the air isn't dense enough to take advantage of the higher octane. This is the same reason that putting 91 in a car tuned for 87 does you precisely zero favours.

[HiSpec]

Originally posted by schocker

That doesn't mean to switch from 91 to 89 though, when you go lower it switches from 87/89/91 to 89/91/93.

Usually one octane grade lower means 89... I don't believe octane 90 is available to us.

[Xtrema]

21 mins segment that can be said in 5 mins tops.

Do what the manual said. Paying higher grade that what manual recommended has no benefits.

[Aleks]

Originally posted by Hallowed_point


Oh totally agree on turbo cars. Heck my Si takes 91 and it needs it being so high strung N/A. Wouldn't dream of 87.

I suppose it's more the attitude of higher octane = better performance for all.

Bang on with why the tune was unnecessary on the 5.0 at that stage..now aluminum heads and a cam - different story!

Nothing would happen if you ran 87 in it, other than losing 5-10 top end hp. 91 isn't required in the Civic Si, it's only recommended. Mazda 3 has a 13.0 to 1 CR and runs regular gas. If you put Shell 91 in it with E0 gas you will probably get better mileage than if you put E10 regular gas in your Civic though.

I wish I could make up the difference in premium with mileage. I would need 2-3 extra L/100kms to offset the cost. Won't happen even with E0 gas

[Sugarphreak]

...

[Tik-Tok]

Yeah but those shady gas jockey salesmen are convincing people otherwise!

On another note though, I was already pissed off before that Shell's premium was increased again to a 20c difference, but now I see in the video, Ontario is still only 15c. Mutherfuckers!

[Hallowed_point]

Originally posted by Aleks


Nothing would happen if you ran 87 in it, other than losing 5-10 top end hp. 91 isn't required in the Civic Si, it's only recommended. Mazda 3 has a 13.0 to 1 CR and runs regular gas. If you put Shell 91 in it with E0 gas you will probably get better mileage than if you put E10 regular gas in your Civic though.

I wish I could make up the difference in premium with mileage. I would need 2-3 extra L/100kms to offset the cost. Won't happen even with E0 gas

True..but with how I drive it I like to use every one of the 197 ponies daily. It's boring to drive like a normal civic haha. Doesn't even hurt the mileage much so it's win-win. And 5-10 is a decent loss on a low hp car. I know that I could run 87 fine, but I just like having all of the hamsters available.

[bart]

the worst thing about AB pumps is the hose is shared, that is garbage, each octane should have a dedicated hose, instead i get 5 liters of the crap the person got before me

even if you don't have a tune for 93, vw and audi's detect the better fuel and will give you more power (their turbo motors)

weeeeeeee, on this gasoline i used up a full tank in 40 mins 220km later lol