First off, what engine do you have in your car, and second, what grade of gas do you run? If you run premium does it make a noticeable difference in mileage and performance? Been thinking of switching grades and wanted to see what others are doing.

 

87 all day long

 

Supercharged 3800 Series II.
Premium gas.

I ran it with 87 octane once. Ran like crap IMO. But maybe my standards were too high.

 

i run 91 in my LS4. i ran 87 in it for about a week then realized 91 was much better

 

Depends on what your tune is calling for. I'm supercharged, headers, high compression and run 89. No knock, if not 1-2 degrees. The fuel won't make a difference if your engine isn't set up to use it.

 

I run 87 in my NA 3800 :p and also wondering if i could use a higher grade, and will it be better/noticable? :p

 

Unless you are getting knock, there is no reason to lol.

 

My car is tuned for 93, my Camaro knocks like a beast without 93, I think there might be a bad mail-in tune on it or something... I need to get my HPTuners and finally get it checked out.

You have the LS4, you should be running the highest octane you can find in your area lol

 

Me Too. If i'm only putting in a few dollars to top it off tho I'll put in the cheapest and i don't usually see a difference.

 

Oh and why do I love Nebraska, because 89 octane is cheaper then 87