Is every one using 91 octan fuel

Rob

Husky nearby me has 87 and then 94 : /
So I looked in the manual and it says the recommended is 91, putting 94 isn't gonna benefit me in anyway. So, I usually fill up 1/2 tank 94, then come back in a couple of days and fill up 1/4 tank 87. Manual says it's ok...

FERRARI

If your can get NO ETHANOL GAS in your area you will notice a big difference

ChrisSlicks

You can get a slight benefit from the higher octanes as the ECU continues to advance timing until it detects knock, the difference is slight however.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

Rob

^ Of course, it will make some difference, nothing noticeable however... If I can cheat and save a couple bucks once in a while, won't hurt the car, as long as I'm not running only/or majority 87 I'll be fine I reckon.
I wish there was pure fuel around here, but I don't think there is... I'd for sure try it. Can you notice the difference in just normal day to day driving? Does it burn faster or is there no change in that?

FERRARI

OMG! the difference is more than you would believe......and you get more Miles Per Gallon.......

KillerBee370

I just piss in my tank after a night of drinking and this happens...

dixon cider

Love your avatar btw. My all time favorite movie.

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kielbasa16

Only if it was Four loko you were drinking right?

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KillerBee370

Tuaca!

ImportConvert

Really? I have NEVER heard of a vehicle that does this. There are set values in the PCM that it will advance to, and that's it--in every car I am aware--except the Z?

ChrisSlicks

There are of course finite limits programmed, they are not infinite. But in general the VQ's are allowed to use very aggressive timing out of the box, and mostly run with timing retarded below maximum values unless all conditions are perfect.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

The BlueMax

We use reformulated gas in our state which uses more alcohol, one station attendent told me that plus and premiem were about the same or if you mix regular with premiem 50/50 it comes out to 90% premiem. All I know is with my GM LT1 5.7 liter I can run regular and hardly notice the difference due to V8s massive low end torque. In the Z the engine is more like a motorcycle very little low end torque and I noticed a real drop off in performance, so I just run 93 octane.

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The Blue Max