Can i use 89 midgrade gas in my car? Shell or BP?

[artificialist]

Originally Posted By: asand1
http://www.v6-s12.com/Specifications.htm

9.0:1 compression, I would use premium.

I see a knock sensor, so that may he he will benefit from higher octane.
He would have to try higher octane fuels check performance each time.

I wonder if his knock sensor even works properly anymore. 1980s engines typically only showed an error code if the sensor resistance was out of range.

 

[circuitsmith]

In hot weather, 90F and above, I believe I can tell when the knock sensor is being used in the Matrix in my sig.
When accelerating up through the gears I sometimes hear a ping or two when I get back on the gas.
I ran a tank of 89 instead of 87 during a heat wave last year as an experiment.
No intermittent pings and the engine seemed a little peppier.
No significant difference in MPG's though.
This was mostly stop-and-go driving.
I'll be going on a road trip this summer and I'll see if a tank of 89 makes any difference on the highway if it is hot enough.
For keeping the fuel system clean I pour a bottle of Techron in the tank every 2 years or so.
I typically buy the cheapest gas I can find.

 

[Clevy]

Originally Posted By: raytseng
meh, too much talk over just a few bucks. (Depends how much of an price increase in the OP's area)

If I were OP, if it scratches an itch, just run like a few tanks of midgrade.
Say go through 60 gallons at $3 vs $3.10.
That's like a difference of $180 vs $186 of fuel.

Switch back through 2 tanks of regular.
Let the results speak for themselves. Notice/feel anything different?
If you even "feel" better about it, it's worth the $6 in emotional relief



Well said.

 

[Malo83]

I run 89 in my O8 Malibu LTZ with a 3.6 v6, car runs great, owners manual states to run 89 for better performance with the v6

 

[camrydriver111]

Use your butt dyno.

 

[Bottom_Feeder]

Originally Posted By: asand1
http://www.v6-s12.com/Specifications.htm

9.0:1 compression, I would use premium.

9:1 is not very high.

 

[OVERKILL]

Originally Posted By: asand1
http://www.v6-s12.com/Specifications.htm

9.0:1 compression, I would use premium.


That's not high compression. Our Charger is 10.5:1 IIRC and specs 87 with 89 as "preferred". The BMW is 11:1 and specs 91.