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Old 03-06-2013, 10:10 PM   #761
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Quote:
Originally Posted by Bombadil View Post
http://blog.truecar.com/2011/03/03/p...s-regular-gas/

http://www.cartalk.com/content/premium-vs-regular-0

http://www.cbc.ca/news/canada/story/...emium-gas.html
"In a test conducted for Marketplace, Stanfel fuelled up a 2013 Chevrolet Cruze — which is designed for regular fuel use —with Shell's regular, then premium V-power gas, and simulated identical drives with each. He found the high octane fuel didn’t burn efficiently and produced extra hydrocarbons, compounds that contribute to the formation of greenhouse gases."
That is a Chevy Cruze not a Ford Focus, and I didn't even check the other links as they are probably just as irrelevant. Wait...I just checked them, I was correct.
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Old 03-06-2013, 10:10 PM   #762
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Originally Posted by AZfocus2012 View Post
That is a Chevy Cruze not a Ford Focus, and I didn't even check the other links as they are probably just as irrelevant.
Go read and educate yourself.
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Old 03-06-2013, 10:14 PM   #763
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Originally Posted by Bombadil View Post
Go read and educate yourself.
Sad to say but you need to take your own advice, as that info is old news and not relevant to modern Ti-VCT engines.
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Old 03-06-2013, 10:16 PM   #764
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Quote:
Originally Posted by Bombadil View Post
http://blog.truecar.com/2011/03/03/p...s-regular-gas/

http://www.cartalk.com/content/premium-vs-regular-0

http://ask.cars.com/2012/03/does-pre...r-mileage.html

http://www.cbc.ca/news/canada/story/...emium-gas.html
"In a test conducted for Marketplace, Stanfel fuelled up a 2013 Chevrolet Cruze — which is designed for regular fuel use —with Shell's regular, then premium V-power gas, and simulated identical drives with each. He found the high octane fuel didn’t burn efficiently and produced extra hydrocarbons, compounds that contribute to the formation of greenhouse gases."
Again that's a port injected engine that is not tuned or designed to run on anything other than 87 octane fuel.

The 2.0L GDI engine in the 2012 Ford Focus runs at a 12:1 compression ratio with gasoline direct injection (the fuel injector is squirting liquid fuel directly into the cylinder and not into the intake port), as well as variable valve timing. 12:1 compression ratios until recently have required high octane fuel to survive as they would knock and rattle and suffer the catastrophic effects of spark knock on regular fuels because the fuel would be super heated and already mixed with the air in the proper ratios to ignite before the spark plug had the chance to set the mixture off.

Direct injection of the liquid fuel has a cooling effect on the charge while the liquid evaporates inside the combustion chamber allowing for greater efficiency and power at high compression ratios on lower octane fuel. This is also helped with the variable valve timing being able to precisely control air delivery and valve overlap to suit the needs of the engine at that given moment.

The PCM can and will adjust for differences in octane rating, especially in the Flex fuel cars that can also run E85 which has a similar octane rating to premium or mid grade fuel, but much less energy density.

The owners manual for the 2012 even states that using higher octane fuel may provide improved performance, and that octane levels below 87 are not recommended.
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Old 03-06-2013, 10:18 PM   #765
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Here is an old video that offers a little education on modern fuels and modern engines.

http://www.youtube.com/watch?v=gQghB4asSnI
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Old 03-06-2013, 10:21 PM   #766
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http://www.autoguide.com/auto-news/2...n-regular.html

"Use what’s in the owner’s manual. Don’t use more, don’t use less” said Bill Studzinski, Fuels Technical Specialist at General Motors. He also said drivers “should not run the octane above what’s required in their vehicle,” because there is no real benefit."

"Stephen Russ, Technical Leader with Ford Motor Company Engine Engineering echoed much of what his cross-town colleague had to say. If a driver runs premium fuel in a vehicle that only requires regular he said, “typically it would not be noticeable.” But there could be slight benefits in certain situations such as hot, dry weather or while towing."
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Old 03-06-2013, 10:30 PM   #767
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Quote:
Originally Posted by Bombadil View Post
http://www.autoguide.com/auto-news/2...n-regular.html

"Use what’s in the owner’s manual. Don’t use more, don’t use less” said Bill Studzinski, Fuels Technical Specialist at General Motors. He also said drivers “should not run the octane above what’s required in their vehicle,” because there is no real benefit."

"Stephen Russ, Technical Leader with Ford Motor Company Engine Engineering echoed much of what his cross-town colleague had to say. If a driver runs premium fuel in a vehicle that only requires regular he said, “typically it would not be noticeable.” But there could be slight benefits in certain situations such as hot, dry weather or while towing."
Again, for a port injected engine this may be true, but you're missing the point.

A high compression engine typically requires high octane fuels. Something all your sources keep saying. This engine in the Focus runs at a very high compression rate compared to most port injected cars that are also capable of running on 87 octane fuel in a pinch.

If anything the car is detuning itself to not knock on 87 octane fuel, but in any case members have reported a smoother running engine, not every one agrees on the fuel economy benefits, but the engine seems to make more power.

Quote:
Octane recommendations
Your vehicle is designed to use
“Regular” unleaded gasoline with a
pump (R+M)/2 octane rating of 87.
Some stations offer fuels posted as
“Regular” with an octane rating
below 87, particularly in high altitude areas. Fuels with octane levels
below 87 are not recommended. Premium fuel will provide improved
performance.
From the fifth printing of the 2012 Ford Focus owners guide page 356.

Premium fuel will provide better performance, but fuels below 87 octane are not recommended.
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Old 03-06-2013, 10:45 PM   #768
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Consumer Reports has stated that they have tested multiple direct injection engined vehicles with both 87 and 91 and found no difference in gas mileage.
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Old 03-06-2013, 11:03 PM   #769
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Quote:
Originally Posted by Bombadil View Post
Consumer Reports has stated that they have tested multiple direct injection engined vehicles with both 87 and 91 and found no difference in gas mileage.
Members here who actually own the car have seen performance benefits, either better mileage, more power, a smoother running engine, or a combination of the above.

So until you've tried it for your self you don't have much else to add to this conversation.

I doubt that consumer reports knows what they are talking about in terms of how cars actually work. Its not a household appliance and they also like the bland Toyota Camry.

Some higher octane fuels also contain less ethanol, less ethanol = better fuel efficiency in and of itself due to the higher energy content vs E10 fuel.
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Old 03-06-2013, 11:05 PM   #770
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If you have E10 87 octane, and E0 91 octane, you'll get 5-10% better mileage with the 91 due to the lack of ethanol.


You can make up for the higher cost of the 91 with the better mileage.......
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