i used to only fill up at station A and would never go anywhere else, but it's all the same. i pass the same amount of miles with a tank wherever i fill up. i usually fill up at QT by the house now since it's on the way.

I use only shell, apart form the odd time I've had to get a few gallons to get to a shell, and I've gone through over 500 full tanks of gas now, no problems, always about the same mileage. I have seen it, friends of mine, who buy "the cheap gas", and they told me how much that save buying gas there...I told them to fill up at a good gas station and see what they get for mileage...they got about 150 kms more on a tank, they haven't been back for the cheap gas.

As far as the additives go I know alot of people say they are useless and dont do anything. But I have seen first hand through tuning and using knock headphones on these cars that it does help you. Now this is a boosted car that I am tuning right to edge of knock. But I have tuned it, filled up and had it knock, threw some additive in and the knock went away.

Again its just what I have seen/heard personally. I know many people will disagree.

Loyal to no gas station, only gas prices!!! QT and Racetrack usually have the best prices here so it's always one of those.

:iagree: :rofl2:

This actually works?

http://img.photobucket.com/albums/v2...f.png~original

:rofl2::rofl2:

RE: Shell V-power... uh, okay. Although that is far from a controlled study, if the octane rating is the same, and the results are genuine, then the differences are likely due to the additives. If the engine is tuned for a higher octane, unless it was re-tuned, I call BS on the whole thing.

If tuned for 93 AKI, we wouldn't expect much worse results from another 93 AKI fuel...

In any case, Shell is clearly a sponsor for them, so take that with a pinch of salt. Likewise, Sunnoco sponsors NASCAR, hence all the hype there...

RE: Octane Boosters -- I've seen a few lab test shoot outs of various octane boosters -- I believe there's one by Torco that actually is found to raise it about a full AKI point (RON+MON/2), but most of those additives (104 Octane boost, et al) barely budge it a fraction of a point.

It's hard to say what was wrong with the gas you got (water? lower than claimed AKI?), but if you can find a Sunocco with 100 AKI pump gas (only mentioned because I know they have that at some stations -- another brand of that high an octane would be fine if you can find it), a few gallons of that shouldn't hurt, and will help ensure the fuel in the tank is closer to the octane rating needed.

You can find charts on octane blending if you google it to give you an idea how much you need to add.

If it's water in the fuel, you could try adding some Heet (methanol) or toulene to suck it up.

Anyway, unless you are tuned for it, there's no need to go higher than 93. I know of zero evidence that the ECU will allow more advance without tuning just because of a higher AKI. It might help if you were running on the ragged edge on a hot day on the track to stave off incipient knock, but for DD, don't expect any real improvement.

No idea on Risoline -- never heard of it.

EDIT: Looks like it has some alcohol to absorb water. I'm guessing that also helps provide the "stabilizing" action? The alcohol probably also nudges up the octane.

i think that because we are using 93 oct it's sitting in the gas station tanks longer no matter what since most cars don't need it. most people and their cars only need the lower oct so why waste the $$. maybe the people stopping at walmart/costcos go there for the cheap prices but get the high oct since it's also cheaper than most other places. hopefully because that's what i do, get the high 93 oct at the cheaper places.

There are a ton of BMWs around my area, I would hope they are using premium. I'm not worried about gas sitting.

Came across this article...once again, some will always say "gas is gas"...but I simply don't believe it...

All Fuels Are Not Created Equal - Technologue - Motor Trend

And the Shell F1 video is just fun...I like to joke around with people if they ever ask about my Z and say that it uses the same fuel that propels an F1 car...and then of course explain

I use Shell or BP. After years of using premium, these seem to work the best. You notice it more on turbo cars when you get spark knock (detonation). As far as injector cleaners, BG 44K is the only one that works. Seafoam and all the other stuff is junk. Doesn't work. Octane boosters are worthless. Just my .02.

Kroger, at least in Ga, uses BP gas. Regular octane is refilled daily. High octane at least once or twice a week.

OP you must have let the tank run too low and have issues as a result

In the 11 years I have owned various VQ engines I have never had a problem with any particulat premium brand. I have run them all and will say that we as enthusiasts tend to over think fuel

Your paranoia with off-brand premium is unfounded and will only get you in trouble driving around aimlessly

P.s download the "Gas buddy" app so this doesn't happen again