You need to see if there are pumps there or not. Its not a simple switch over and YOU must tune for it.

Run the highest you can find.

 

I've heard that putting premium in a car where 87 is recommended is a waste of money, if not even reducing performance slightly. Is it the same issue putting 93 or 94 where only 91 is recommended? Or does chevy say 91 is just the minimum recommended for the 2.4 and 2.0?

I'd think the difference is a "shitbit" in this case but are there any octane gurus on here that would know?

 

I'm running 91 in my car. I run 93 when I take it to the track. I was told by my dealership to not put anything less than 91 in. At the gas station I go to they sell 87, 89, 91 and 93.

 

91 is the best you can get at the pumps in Cali and that's what i use.

 

We only have 91 here to my knowledge, but yeah don't run less than 91 its only a few dollars more for a fill and thats what gm says you should run

 

I run 93 octane all the time. Only time it got less was a full tank comming home from the dealer.

 

94 premium

 

i run 93 all the time..no switching it up at all.....93 all the way

 

91 is fine for the s/c cobalt. i put in 93 everytime though, just because it's not that much more a gallon.

 

Its been said that the SS can get better gas mileage running on 89, but as far as I know its not been confirmed. The SS/SC needs the best you can get. By the way DWK5150 I'm curious, what else did you have to do to the car besides injectors, plugs, and remap the ECU for the E85?

 

Running and tuned for 94 octane.

 

I run the best I can get. Currently I am running 92 otc, when I was in Cali it was only 91. When I was in Texas I ran 93 otc and I can tell the difference in hp and mpg on all three. I did happen to get a tank of 100 otc AND IT WAS KICK ASS! Even when getting on it I got 35 mpg and it was way more power than normal. As far as running higher than 87 in NA or lower compression auto's yielding lower or no mpg and hp gains? I have herd that from some but my self I use the best in all my cars and see better performance all the way around, even in a 95 metro that I had.

 

93 is the only thing around here. VERY few places have 91. But i would run 91 if it where more common.

 

I use 93 in a SS N/A... I actually noticed a difference between 87 & 93 MPG & performance wise.

 

sunoco 94 ftw

 

93

 

87 in the good ol' LS.

 

93 only, never went less never more