anyone using premium gas ?

[cessna1]

I think it would be interesting to see what 87 E0 would do compared to 91 E10.

[eweisbard]

If the engine is not knocking or pinging, there is no performance to be gained by octane alone.

[dyn085]

Originally Posted by eweisbard

If the engine is not knocking or pinging, there is no performance to be gained by octane alone.

Says the guy who hasn't tried it or researched it.

[Kabigon]

Originally Posted by eweisbard

If the engine is not knocking or pinging, there is no performance to be gained by octane alone.

Consider the 2013 Mustang GT (5.0L Ti-VCT V-8 engine)
Recommended fuel: unleaded regular
HP: regular fuel: 402 @ 6,500, premium fuel: 420 @ 6,500

Two questions:

1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?

2) Why don't you believe that is possible for the PCM to adjust for different octane levels?

[Power Surge]

Originally Posted by Kabigon

Two questions:

1) Do you think that the 5.0L engine is constantly "knocking or pinging" when using unleaded regular?

2) Why don't you believe that is possible for the PCM to adjust for different octane levels?

And how do you think the PCM knows what octane fuel is being used?

By the amount of spark knock it picks up.

[eweisbard]

Octane is for antiknock, if its not knocking whay do you need more. Here is something else that I learned a a training school. Ocatne makes fuel more stable to prevent autoignition, meaning ignition from a source other than the spark plug like a hot piece of carbon. Too much octane can actually cause an adverse effect by making fuel harder to ignite reducing performance. I have tried it with absolutly no effect in my 2.0 zetec. Dont assume what people know or have tried.

[dyn085]

I fueled up this morning and the cost difference between regular and premium (v-power at shell) was $0.28. Even a 12 gallon, bone dry fill is only $3.36 increase. Is that seriously so much out of someone's wallet?

Some people need to get out of the past and move into the current world of technology. I am the first to admit that I don't see enough of a benefit in my Nissan Armada to use premium in that vehicle. It doesn't give me the additional gas mileage nor do I need more power. Did I try it? Yes. That way, I would know 100% whether it worked for me or not.

But the GDI engine in our Foci is more sophisticated. For $3.36 a tank and 3 tanks ($10.08, and approx 1000 miles worth of driving), you will understand. Save up the cash this month and use it next month if you have to. Then, when you see that your car is running/idling better and is getting better fuel economy, good job!

Or just continue to believe that the gas companies are out to ruin you and use regular.

[Joeywhat]

Originally Posted by eweisbard

I have tried it with absolutly no effect in my 2.0 zetec. Dont assume what people know or have tried.

Well, none of us are trying this in a Zetec, sooooo....

[dyn085]

Originally Posted by eweisbard

Octane is for antiknock, if its not knocking whay do you need more. Here is something else that I learned a a training school. Ocatne makes fuel more stable to prevent autoignition, meaning ignition from a source other than the spark plug like a hot piece of carbon. Too much octane can actually cause an adverse effect by making fuel harder to ignite reducing performance. I have tried it with absolutly no effect in my 2.0 zetec. Dont assume what people know or have tried.

Your ZETEC was Direct Injection? Mine wasn't.

You're missing the point.

[eweisbard]

Applies to all engines whether diesel or gas, cabureted or fuel injected, lawnmower or zetec.