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Old 05-13-2012, 03:34 PM   #161
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There's no right and wrong answer, because every person will have a different experience.

Even with dyno tuning, variations in ambient air temperature and humidity, as well as altitude will affect mileage and performance.

Each person's driving habits are different as well. I've put 8,000 miles on my 2012, I'd guess probably 60% city and 40% highway. I've NEVER seen more than 35mpg, even on trips that were 100% highway, driving with the cruise control set the entire trip.

*I do have a heavy foot, so this is most likely my fault.

I tried 93 octane for 3 tanks of fuel and did NOT notice any improvement over 87.

After that, I switched back to 87 and removed the cover on the air intake.
Despite higher intake air temps, I did see an average gain of about 4mpg over 8 consecutive tanks of 87 octane, as well as better throttle response in the low end. Throttle response is better in the high end also, but not as dramatic a change as in low end. The engine stumbles less now as well, as long as I can get that stupid DCT transmission to downshift appropriately.

Next, I plan on trying another 3 tanks of 93 octane with the cover removed.
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Old 05-13-2012, 03:40 PM   #162
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Quote:
Originally Posted by Power Surge View Post
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).

That's what I understood from it. Unless your racing your Focus in the Daytona 500 I think I'll stick with 87. I average 34 mpg between city and highway using 87. These engines werent designed for high octane fuel like a higher performance engine would be, hence the manual stating to use 87. My fathers Acura states to use 93... He's not out there looking for racing fuel
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Old 05-13-2012, 03:47 PM   #163
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Quote:
Originally Posted by Power Surge View Post
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).
I think if that is what they meant to say they would have written just as you did, but they didn't. To me it is two separate thoughts, Don't use less than 87 octane, and they told you where that might be encountered, and premium fuel will provide an increase in performance. Simple. Plus my experience using shell V-Power has shown me, that just as in the video, oh yea, did anyone watch the video, I am getting an increase in performance using premium.
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Old 05-13-2012, 04:01 PM   #164
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This isn't rocket surgery folks

When the owner's manual says "Premium fuel will provide increased performance" under the heading "Octane recommendations" it sounds completely unambiguous and unqualified to me.
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Old 05-13-2012, 04:22 PM   #165
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Originally Posted by AZfocus2012 View Post
I think if that is what they meant to say they would have written just as you did, but they didn't. To me it is two separate thoughts, Don't use less than 87 octane, and they told you where that might be encountered, and premium fuel will provide an increase in performance. Simple. Plus my experience using shell V-Power has shown me, that just as in the video, oh yea, did anyone watch the video, I am getting an increase in performance using premium.
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.
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Old 05-13-2012, 04:23 PM   #166
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Performance doesn't mean better gas mileage.
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Old 05-13-2012, 04:25 PM   #167
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Quote:
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.
I see your point, but this is not a novel, just an owners manual.
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Old 05-13-2012, 04:27 PM   #168
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Performance doesn't mean better gas mileage.
Hum, an increase in performance does not mean I can go further down the road on the same gallon of gas????? OK
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Old 05-13-2012, 04:35 PM   #169
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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
I believe in this context, that "performance" means gains in HP or torque, not gas mileage.
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Old 05-13-2012, 04:40 PM   #170
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Quote:
Originally Posted by mienna View Post
I believe in this context, that "performance" means gains in HP or torque, not gas mileage.
But would that not manifest itself as an increased MPG, and if not, then why not. It sure seems to have in my Focus.
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