It is always a good idea to run higher octane, another thing that you should rember is that if you are going to buy the higher octane is that you get what you pay for. Most gas stations that have one fuel pump for the 3 or 4 octanes usaully have about six gallons left in the line. So if the ******* before you baught 12 gallons of 87 octane and you buy 91 or what ever you want you will get six gallons of 87. so make sure that the gas stations have a seperate pump for the different gas, which could ruin your tune if you have one.

 

I never knew that. Interesting.

 

Heh. Last time I filled up it was $2.99/gallon for e85. At least my mileage has improved. Was getting 12mpg, now it's jumped up to about 15mpg.

 

If you're running a stock SS/SC, then GM just "reccommends" premium, but it'll dial back the timing for 87/89. So in other words, the car will run like ****. (Before anyone tries to call me a moron, see the following screenshot from section 5-5 of the 2005 owners manual):


If you're on ANY of the stage kits (1, 2, or 3), then you must use 93 (or 91 if thats the only thing in your area).


I do not know if this applies to the LNF SS/TC's, but I'd say probably not.

For the SS/SC guys, if your area supports E85 pretty readily, look into that. Not only is E85 cheap, but it will also allow you to run aggressive timing. Trifecta can easily tune you for E85 (DO NOT RUN WITHOUT A TUNE). You will need larger injectors to accomodate the higher flow that E85 requires.

 

Although true, the number of gallons left over isn't that high... more like a third of a gallon according to the American Petroleum Institute.

Does Fuel Get Left in the Pump Hose? - WSJ.com

That being said, ANY 87 left over in the line is a ripoff if I'm paying the extra cash for 93.

This is another reason I'm wanting to just convert to E85... but it isn't even remotely feasible given that there are only 3 pumps accessable to the public in the entire county (There are two more, but one is on the turnpike and the other is for Federal vehicles only). If I stayed in the county all the time, I could, but since I have to fill up outside of Allegeheny County quite often, it becomes a major problem since WPA is notoriously dry of E85.

 

AMEN to that. They need a pump in Beaver Falls IMO, get the road racing crowd in.

PA in general isn't e-friendly. I missed a good friend's dad's funeral cause there was no way I could make it between stations.

 

Run 91 / 93 (depending on altitude) in your boosted car - not only will it perform like it was designed to, you will get better mileage, maybe even enough to offset the extra cost

 

I went from getting 26mpg in my balt down to 14mpg in my impala SS....quit your bitching and deal with the extra $3 a fill up. Cheapass!!!

 

GOOD GOD!

E85 here is still like $2.50

 

Somebodies retarded

Make that two... There must be hundreds of thousands of cars that are fucked because of this! OMGWTFBBQ!

 

Theirs did too. I went to Japan in 2008 and they had the same complaints as we did. Why did the gas prices quadruple in about 10 yrs? They just went from paying a lot more than us to way way more than us.

 

Well why can't GM put that in the manual. None of this GM recommends this... or GM requires that... crap, but something along the lines of: Look, you cheap ****. If you try putting this cheap **** in your car, it will **** your **** up and we will void the **** out of your waranty and we'll replace jackshit for you

 

^^this.

I lived in Europe up to 10 years ago. When I left, gas was the equivalent of 59 Euro cent per liter (this was before the Euro). Today, it's closing in on 2 Euros. That's an increase of 339%. And by the way, in $/gallon that's about 10 bucks!! Bottom line is that the US is one of the cheapest countries to fill up your car.

 

Break out the cheese

 

If you're saying probably not to premium being required in TCs then you're totally wrong. Just about every FI engine requires it.

 

To me "required" means **** will break if you don't use it. Go put 87 in your LNF and I highly doubt anything will break. Moronic and cheap to do it? Yeah.

Hence, "recommended, but not required" for all Cobalts.

 

I meant "probably not" as in the applicability of fuel requirements page from the manual page I put up (Since it is the 05 one). It was primarily a disclaimer to say to check your manual if you have the SS/TC to see what applies to you.

 

Me too!

Yes they do!