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Old 05-13-2012, 04:41 PM   #171
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Originally Posted by AZfocus2012 View Post
Hum, an increase in performance does not mean I can go further down the road on the same gallon of gas????? OK
Define performance, are you referring to better acceleration, engine response. When your driving 65mph, which performance characteristic helps increase your mpg.

My understanding of Octane: It will provided more power and not more mpg. I have never seen any real MPG increase in my 30 years of driving. Too many environmental variables can effect this too. Plus the FF is built for 87 octane so performance maybe, MPG not so much. Yes some people are using 93, but most because they have Exhaust, SRI or CAI. It will be debated forever. Just my 2 cents... Not saying you are wrong either..
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Old 05-13-2012, 04:42 PM   #172
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Originally Posted by AZfocus2012 View Post
But would that not manifest itself as an increased MPG, and if not, then why not. It sure seems to have in my Focus.
nope
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Old 05-13-2012, 04:43 PM   #173
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Originally Posted by mienna View Post
I believe in this context, that "performance" means gains in HP or torque, not gas mileage.
agree
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Old 05-13-2012, 04:47 PM   #174
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The fact that the car has a compression ratio of 12:1 would favor higher octane gas. The smarts in modern cars and the ability to dynamically change valve and ignition timing and other parameters as well permit you to use lower octane gas but 12:1 would still prefer higher octane.

I can imagine a dual performance benefit of slightly more power AND slightly better mpg, but just how much better the mpg is I can't say and short of a true scientific series of tests it would be very difficult to see that difference unless the differences is larger than about 5% percent or about 1.75mpg.

I'd put the difference in price between the highest octane gas versus the lowest octane gas to be about 7%, and the difference between mid and high octane being about 4%. So, if the lowest octane is below 87 than the real difference would be between mid and high so roughly 4%. If the improvement in gas mileage is greater than 4% then it would be cheaper to use high octane versus mid octane.

Those of use living in mountain regions usually see the low octane being 85 or less than 87 so we need to go with either mid grade or premium gas.


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Old 05-13-2012, 04:50 PM   #175
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The way I read that verbage in the manual, is that it means in areas where regular is considered lower than 87 octane, to use fuels labeled premium for better performance (especially in high altitude areas).
Huh - that's an interesting take, and I actually sort of think I agree with you.

At first I thought it was pretty clear that it meant simply what it said, but in context it seems to be saying that premium fuel will give better performance than sub-87 octane fuel labelled as Regular, not better performance in general.

But hey, I think people should put in whatever fuel makes them happy. My BMW asks for 91, so that's what I use (actually I use 93 because I can't find 91 here). I think when I get the Focus I'll use 87, because IMO that's what it seems to be asking for.
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Old 05-13-2012, 05:28 PM   #176
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Originally Posted by Power Surge View Post
Well from a proper English stand point, if the part about the higher octane was unrelated to the prior sentence, than I would think it would have had a separate spaced line in the text. Just my 2 cents.
If you're going to make a point about proper English you should probably start with proper grammar. just sayin
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Old 05-13-2012, 05:34 PM   #177
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If you're going to make a point about proper English you should probably start with proper grammar. just sayin
You type that and then make a comment about my grammar? LOL

And yes, that was supposed to be then, not than.
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Old 05-13-2012, 05:42 PM   #178
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Originally Posted by turbo2300 View Post
Actually the term FFV is including e85, not just 87-93 octanes. Otherwise everything would be a FFV.
Yes, I understand what FFV means. You do realize that e85 has a higher octane rating than 93 though, right? That is why I stated what I did.
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Old 05-13-2012, 05:44 PM   #179
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I watched the YouTube video and here's what I got from it....

The cars that require higher octane fuel get better performance with higher octane fuel than with lower octane fuel.


I wouldn't place a Ford focus in the same performance catagory as a gti or wrx
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Old 05-13-2012, 05:46 PM   #180
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If you look at the fine print in the latest Taurus SHO commercials it states that to get the full 365 hp you need to run premium fuel. So if ford is programming the PCM on the SHO to sense different octanes and adjust power output accordingly, then they are probably doing it on our focii also.
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