Would it be worth it to put in 89 unleaded in my car rather than 87?
or hsould i go higher to 91?

 

87 is all you need and want

 

just stick with 87

 

87 is cheaper, and 2.2s are tuned for 87. Anything higher and you are just wasting money.

 

i put 89 in since down here in jackson the gas goes 89 91 93 rather than 87 89 91

 

unless your tuned it really wont make a difference hp wise what gas you run. i just use 87 octane till i really get into some heavy mods

 

I now use 93 octane after using 89 since i got my car. My reasoning:
After installing my GMPP sport exhaust and straight cut tip i noticed a build up of a black substance which im assuming is carbon inside of the tip and after i would wipe it off it would build up again after about a week. After running 93 octane this is no longer a buildup of black substance. I'm assuming this is because the fuel is burning cleaner and more efficiently. This may mean nothing or there may be something wrong with my engine =P who knows! PLEASE correct me if i'm wrong.

 

your wrong

but its ok. its a very common misconception


higher octane fuel doesnt burn cleaner or more efficiently.
its just harder to ignite thats all. which reduces knock, allowing more agressive tuning.

in a car tuned for 87 (like the 2.2) it will do sweet F.A

 

if the price isnt crazy high i tend to put in 89. car seems to run a little smoother and it seems like i notice a bit of more power (prolly jus in my head tho) lol

 

Hurray for ethanol! 89 is cheaper by me. It's $2.85/gallon for 89 (10% Ethanol), $2.93/gallon 87 unleaded, and like $2.97/gallon for Premium 91.

 

yep it's just in your head.

 

i can get 87 for 2.99 in my town and thats the lowest its been in 6 months..

 

actually higher octane does burn cleaner and it also makes for the Air to mix and combust easier in the combustin chamber producing less *sut* build up in your exhaust

 

i put 91 octane in all the time, since my car says premium fuel reccomended, and i also work at a gas station. but i dont know, im a 2.4 not sure if thats different.

 

ah....no
thats a myth.
Octane has nothing to do with burning cleaner, or combusting easier.
in fact, its harder to combust when the octane is higher

 

93 is harder to ignite (which creates less knock) and does NOT burn any cleaner than 87 octane. Myth, as an0malous said.

 

You have a 2.4, you are supposed to use 89/91... We are in the 2.2 section, they should be running 87

 

it doesnt hurt the 2.2 to run 91 does it.?

 

it won't hurt anything, but why spend extra $ for nothing?

 

If I'm not mistaken; It is "possible" to have extra buildup from unburned octane because your car isn't igniting it effectively.

 

yeah its not a good idea to run to high octane.
can in fact reduce your mileage and horsepower.

just run what your car is supposed to run, and youll be fine.

 

Sounds good.
Thought i would ask since it was brought up in a convo between me and my friend.

 

Think of it like this......"a homeless man approaches you and ask you to buy him a beer, you can: A) Buy him his usual PBR or B) You can buy him a Guiness. It does you and him absolutly no good to buy the guiness(93octane) when you know the PBR(87 octane) will do just fine" Sorry I tend to think of everything in terms of beer... but you get the idea

 

87..ftw!

 

87.. yay. 3.05$/gal