What Octane grade are you running?

[yOGi420]

Been running 89 in all my personal vehicles forever. I might try out the 91 but I really don't think 2 points is going to mean much. I also feel, if your vehicle does not have the need for higher octane then not only are you wasting money but actually losing power. That is how it is with small single cylinder motors and I would think the same would be true on an auto motor, but on a larger scale. Someone correct me if I'm wrong.

 

[YukonCrazy]

I have only been putting 89 octane in. If the owner's manual called for a higher octane, I would put it in, but since it doesn't, just going to save the money.

 

[mfdrookie516]

My only concern with mid grade has always been whether or not you're really getting what you pay for. I know that most (if not all?) stations mix Regular and Premium at the pump to get mid, and I just question whether or not most stations truly give you what you''re supposed to get.

 

[08grey]

Yea I agree about wondering what you get. I get gas at a really busy Sunoco always and they have 87 89 91 93. And I always wonder how they get 4 grades out there so often.

 

[Goodinblack]

Octane is simply the resistance to burn.

 

[guy from norcal]

Octane is simply the resistance to burn.

yeah, burns my walet i usually run 87

 

[TheFuzz]

Octane is simply the resistance to burn.

More accurately, it's a fuel's resistance to detonation...not necessarily the same thing. Basically higher octane allows the fuel to be compressed more (and reach a higher pressure/temperature) without detonating on it's own before the spark plug fires.

I've heard that the 5.3's in the GMT900 trucks were optimized for 89 octane, hence the reason I run mid-grade. Not all mid-grades are blended fuel - find a gas station with three dedicated tanks. You can tell by the fuel manhole covers, there are two covers for each tank (one is the tank filling port and the other one is access to the turbine sump that pressurizes each tank). Six manhole covers = three separate tanks.

 

[mfdrookie516]

Interesting. The gas station I worked at had 3 holes... 87, 93, Diesel. The pumps were all in the pump housing. I guess they were old school. It was an old full service station.

I may try 89, although I'll likely have to re-tune since my tune is optimized for 93 octane.

 

[Goodinblack]

More accurately, it's a fuel's resistance to detonation...not necessarily the same thing.

Yeah yeah whateva.



It what I meant. I did not want to write a 2 paragraph answer like you.

 

[TheFuzz]

I'm long winded....