Jesus, how much has this cost me...

Jack Raccoon!

Jack Raccoon!

"That Guy"...
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Fuel used....



20240524_151030_HDR.jpg
 
I ask, because I recently became aware of the Ultra 94 at PetroCan (aka Sunoco) - runs about 3 cents a litre more than their 91 price.
Been using it lately when I can find a PetroCan that has it, as not all do.
Is it better than 91? For 3 cents, I'll try it.
A local Shell used to have 93, but it closed a few years ago, and just reopened as a Canco. 91 Premium from Imperial OIl.
 
FYI. I believe 94 has more ethanol.
Heck in winter one can use 87!
Octane combats knock. Engines knock when it's hot out. Computers retard ignition when it hears knock so their really is no harm any time except on performance.
 
Murray20c8 said:
FYI. I believe 94 has more ethanol.
Heck in winter one can use 87!
Octane combats knock. Engines knock when it's hot out. Computers retard ignition when it hears knock so their really is no harm any time except on performance.
Click to expand...
Each to his own I guess, but my car will never see anything less than 91 AKI, unless it's a life or death situation. I always try to drive on the top half of the tank.
I'm still under warranty, and if the ECU has been regularly retarding the timing to compensate for knocking causd by lower octane fuel, and God forbid, sets a DTC/MIL and I have to get it serviced, GM could probably see that in the black box logs, and void the warranty. Per the 2024 owner manual...
Screenshot_24-5-2024_21467_.jpeg

It's probably also counter-productive to knowingly put a lower octane fuel in the car knowing it will cause the ECU to have constantly compensate for it until it's all used up.
Lastly, gasolines are adjusted for temperature differentials, aka summer gas vs winter gas. The former usually costs more because of the extra additives required for better performance in hotter temps.
Just sayin'.... my personal preferences.
 
Last edited:
MKC8 said:
Each to his own I guess, but my car will never see anything less than 91 AKI, unless it's a life or death situation. I always try to drive on the top half of the tank.
I'm still under warranty, and if the ECU has been regularly retarding the timing to compensate for knocking causd by lower octane fuel, and God forbid, sets a DTC/MIL and I have to get it serviced, GM could probably see that in the black box logs, and void the warranty. Per the 2024 owner manual...
View attachment 124327
It's probably also counter-productive to knowingly put a lower octane fuel in the car knowing it will cause the ECU to have constantly compensate for it until it's all used up.
Lastly, gasolines are adjusted for temperature differentials, aka summer gas vs winter gas. The former usually costs more because of the extra additives required for better performance in hotter temps.
Just sayin'.... my personal preferences.
Click to expand...
1716651869919.png


Just sayin
 
Murray20c8 said:
View attachment 124337

Just sayin
Click to expand...
And reading that section in the 2024 manual that follows that, and placing the "recommendation" you posted in context...
Screenshot_25-5-2024_123948_.jpeg

Note the words "of 91 or greater is required." and "a condition of the vehicle warranty".
Over to you Murr.....
(as I said, each to his own)
 
MKC8 said:
And reading that section in the 2024 manual that follows that, and placing the "recommendation" you posted in context...
View attachment 124339
Note the words "of 91 or greater is required." and "a condition of the vehicle warranty".
Over to you Murr.....
(as I said, each to his own)
Click to expand...
See above your post.
Learn about knock. The hotter it is outside the more likely a car is to knock. The cooler it is outside the less likely it is for engine to knock. It's all about burn rates and engine timing. All of which are stored in tables in your computer. There are also knock sensors which detune a car if it hears knock, again no harm, but the likelihood of that in cold weather is extremely low.

INCORRECT OR LOW-OCTANE FUEL​

When you fill your vehicle with gas, you typically have several options for fuel type: regular, mid-grade, and premium. These fuel grades are also paired with numbers, which are the fuel's octane. Octane is a measurement that tells you how resistant a fuel is to abnormal combustion.
 

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