Good day All;
General question for you is it just me or does 91 Octane fuel seem to be used up alot quicker that 87 Octane? I know that 91 Octane is a cleaner fuel mix would that credit it to burn off quicker than 87 Octane? Since purchasing my 2007 Cobalt SS i have used nothing but 91 Octane and find myself fueling after about 180Km's (or the needle fuel gauge needle points to the top) No big deal for me will continue to use the higher octane however was just wondering what everyones opinion is on this issue. Thanks All.

 

I see your form edmonton, me to. its winter its cold. gas milage will go down, and using 87 will make it worse since the car will have to work harder. i seem to average about 180- 200km to a half tank. lots of idle time to though

 

91+ is recommended to run the 2.4 engine

 

I wouldn't run less than 89 unless you have to. There is even a tiny amount of detonation with 89 octane. Get someone with a dashhawk and drive around while monitoring the ping sensors. I am not saying it will ruin your engine but won't be great for it to run 87 with the high compression we have. Especially when it's hot.

You mileage dif may be from ethanol if your running the 10% blend. There is usually a slight drop from that.

I might run a couple gallons of 87 through mine and monitor it with my dashhawk to see what it does.

I have been running 89 for a while and haven't had any problems.

 

I run 87 in the winter since I don't "use" the engine a lot

in the summer I used to run 89 but next summer I'll use 91 since it'll be running a VMS Tune

 

Thanks for the info all and thanks Cruisn yep seems i am on par with you for mileage. 180-200km at half a tank is when i fill up. Lots of idle time as well in the mornings when i start it and warm it up. Sticking to the 91 as thats what i have fed it since the day i bought it.

 

do the same, 87 in winter since im not redlining it everyway..and 91 in the summer...its funny to redline on 87..u can see ur rpms stop slighty for a second in high rpms haha

 

I get about 380km on a full tank when low fuel is on (still has like 6-9 liters left in it)

 

higher octane does not burn "cleaner" or more full. old myth. use the octane that the car is designed to run on. any more or less is giong to affect performance as well as mileage.

also, mileage will get better after a few hundred miles.

 

If ethenol drops the milage you get from a tank, I wonder what the E85 people are going through...

 

another E-town dude. excellent.
i am still on a tank of 87 in my SC from october.
misleading, yes....car sucks to drive in flakes, so its parked.
but i did develop a tune for 87 and keep timing up in the range for outstanding mileage.
power, not a chance. its way slower than a stock 2.2, but its a tradeoff.
3 lbs boost in first gear, 7 lbs in second, athen 12 in 3rd gear., 4th gear gets a little less boost about 11, and thats with a 2.8 pulley on 60#. the car told me it was getting 42 mpg driving at 125kph, going to camrose and back mid october. then i filled up a week after that. i modded the boost to aid me in winter travels, but i never bothered driving the car, i have my trusty AWD minivan.

 

^^ the genius behind my winter tune.

 

what are you smoking? honestly..

octane allows the vehicle to run better, a cleaner, more refined fuel will ALWAYS out perform a lesser, in every fasset. Much like bulk and synthetic oils...if this wasnt true we could all drive around on diesel fuel, cause who cares, its just less refined...no biggy cayse shot said so.

 

umm....no.
go read some more.

 

thats kinda funny cause i got 36-38mpg on my tune in the winter... still running 17-18psi and 20+ timing.... 42 is nice, but im sure you could have achieved it or close easier.


either way

tune>gms2 tune

 

octane rating is a gas's ability to RESIST DETONATION. nothing more. you are believing the myths that have been out there forever. do some reading up on that. o yea, you don't like homework, so here's a link for you: it covers your "more refined" theory too.

http://www.state.mn.us/mn/externalDo...ctaneFacts.pdf

 

I get 45-50 with his tune with a little tweaking.

 

i read plenty, thank ****.

pertaining to shitty canadian gas and winter, its smarter to run better gasoline.

now dont misunderstand what im saying..

im not saying it cleans the engine or just switching to high octane in a base model will make more hp or anything, but it will run smoother, without a doubt.

yeah that pretty insane.... any worries about sidee effects?

 

no, it won't run better! it's amazing how stubborn people are when it comes to this topic. where are you getting your info from, the honda forums? (sorry!) do some real research on octane myths and you'll see that you're posting the top ones. i even gave a link for you to read.

 

hes right...seriously man, octane has nothing to do with running better, or cleaner.

all octane does, is make it harder to burn.

if your running the correct octane your car needs, running higher than that will do sweet **** all.

 

nah i googled it, the argument goes in both directions, even when oil companies and third parties are brought in.

your just as stubborn really...i love 2 way roads.

 

can you post some links to back up what you're saying?

 

did you see the part where i noted my pulley size and octane i am runnin?
i must also tell you, i had a full trunk, 3 passengers, adn driving at 125kph.
42 mpg.

my bad for adding my 2 cents. i shall keep my old guy tricks to myself, and prolly my facility.

 

i wasnt knocking you lol....sorry if it came across that way big guy!

i willtonight when i go home for sure just for u <3

 

So is using 93 octane on a 2.4L not good for it?