i have to use 91, but i would definitely use a higher octane if it was available (although i'm not gonna pay $4.50/gal for 100 octane)

 

Yea I just filled up today, I was so nervous about getting gas because you don't have a realise button you have to push the gas tank lid on the right and it flips open i'm so nervous someone is goin to just wack it! But i put 93 in it. it's only $2.12 here in NJ so i figured what the hell because i go right across the river and regular is almost the same thing! THaks for all the advice!

 

I used to use 91 octane, nothing more or less... usually costs about 90 cents a litre... for 1 cent more per litre, I gave 94 octane a whirl today, sunoco 94... I think the octane measurement on their 94 is wierd... ethynol blend or something... I dont know, wasn't paying attention... however, my car has been sort of rough, since I've owned it... fast as hell, but once it was climbing through the rev's, it wasnt terribly smooth. Well, I opened up the throttle, with my new 51 dollars worth of 'ultra 94' ... and it was quite an eye opener. I was told to stay away from the sunoco 94, until recently (clconversion -- good call). So yeah, i'm definatley hooked on this stuff now.

 

The Sunoco 94 is all I run in mine. I'm chipped, so that'a a bit of a different story. Unless you are in California, Sunoco gas contains MMT, a lead substitute introduced in 1996 when lead in gasoline was banned. In California they use "reformulated gasoline" because of the high levels of ozone in that area. In California, Sunoco has refined with ethanol, methanol, DIPE and other additives to abide by the laws of that state. Gasoline in California cannot cantain metal additives such as MMT or manganese. Long story short, in California, it is possible to be getting a gasoline, methanol/ethanol mix, but they are also adding iso-octanes to maintain performance. Ok, with all that corporate speak out of the way, drive to Nevada to fill up if you can. I hope that made sense to someone, I'm still trying to make sense out of some of Sunoco's explanations.

 

there's no point in putting any lower octane gas. the money you save in gas $, will be offset by the lower millieage you'll get with lower octane.
go with the highest octane available.

 

There is no point putting in octane higher than your call calls for either.

If your car is working properly, there should be no difference. If putting in higher octane than specified results in improvements in mileage or performance, it means that there is something wrong with your car.

 

Yeah definatley, higher octane means longer burn time, am I right? So, if your car is designed to run on 89, and you run 94, your car is programed to allow X amount of time for the gas to burn... so your 94 octane wouldnt be fully burned, when it was pushed out by the exhaust stroke. My car, is chipped, and I have noticed the differece from 91 - 94.

Again, correct me if I'm wrong... My knowledge is fairly limited.

 

i tryed puting in the regular 85 octain in my a4 and it ran like crap so i use the mid grade 89 and it runs just as well as on premium 92

 

I wouldn't do it on a consistent basis.