I just read in the owners manual the 2.4L is supposed to run on premium. Opps, well, at least tank #2 will be the correct gas.

I just got an SS(2.4L) and i was told to put regular gas in it. Where abouts did you find info on the premium gas?

In the owners manual section 5 page 5. I was told regular too, but when I looked in the owners manual, it said 2,2L runs on 87 octane and 2.4L & 2.0L S/C run off 91 octane

Yes it does, due to the high compression.

It's exactly like the SS SC'd, it can run on regular but will experience some power loss. Of course, it won't be as much of a loss as it is for the SC'd, but it might lose some.

At high elevations you should experience no power loss using 87.

At high elevations you should experience no power loss using 87.

umm....how do you figure? I thought huigher elevations exaggerated the situation?

In my okd car---87 323---it pinged under heavy throttle on 87. I out 89 in that and no ping. I run the premium in the SS. 0.05 more then I was paying, so no big deal.

For the SS/SC it says:

Cobalt SS Supercharged will operate with 87 octane unleaded fuel. However, a power loss will be noticeably felt by the driver.

For the 2.2 its says 87

And for the 2.4 it says not yet published

All information was taken from http://www.chevrolet.com/cobalt/specifications/

For the SS/SC it says:



For the 2.2 its says 87

And for the 2.4 it says

All information was taken from http://www.chevrolet.com/cobalt/specifications/


Yeah, Chevy's website says the 2.4L isn't even out yet, but I own one. I am just telling you what I read straight out of the owners manual, I could scan it out.

B-Spot, well, I am at 600ft above sea level, so I think I need the premium. :lol:

I run 87 in my 2.4 and have found no problems. Performance wise it was not a big difference, but that was when the car was brand new. It has gotten faster lately, and maybe the 91 will make a bigger difference now. But they only sell 87,89, and 93 in this area. So, maybe that would be even a bit faster, or not. I am not sure. What does everyone else think?

well the 2.4L is rated at 167hp in the G6 and that just says 87 octane.

So it might be worth 4hp,a bit of torque--at peak rpm that is. Hard to say excatly without talking to an engineer who worked on the 2.4L.

Well I bought the 2.4L SS cause it was the best I could do---so I want all the hp I can get! ;)

At high elevations you should experience no power loss using 87.


I think there is like a two point difference so 91 is like 93 at least here there is, but you do lose 3% per 1000 feet. I'm at 7000 feet, I'll cry when i get to see level and gain that back. Ofcoarse for superchargers and turbos you don't lose as much as naturally aspirated engines.

Yeah, since it is the same price as other companies 91, I'll just run sunoco ultra 94