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Anybody notice any difference with premium in a regular Mk3?

I would periodically fill up my 2012 with premium for several consecutive tanks (like I would let it get down to almost empty on regular and then fill it with premium for the next four or five tanks at least) just to see. I swear the car knew it was being fed better stuff! Like I felt it had improved performance, and seemed to run more efficiently, and even showed to be getting a slightly higher (but just barely) mpg. But I fear it was all in my head...

The dealer I bought my new 2014 from swears they keep premium in their tank at the lot, so supposedly my new Focus was fed premium when they filled it up at purchase... So I filled it with premium the next couple of tanks too for continuity.

I am about due for a new fill up (probably on Sunday), and am torn between sticking with premium or switching to regular or mid-grade...

Opinions? Observations? General (non-troll) comments?
 

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Several threads about this:

http://www.focusfanatics.com/forum/showthread.php?t=274381
http://www.focusfanatics.com/forum/showthread.php?t=468481
http://www.focusfanatics.com/forum/showthread.php?t=505930
http://www.focusfanatics.com/forum/showthread.php?t=383242
http://www.focusfanatics.com/forum/showthread.php?t=422146

My personal opinion is that it drives better with premium in warm weather - I see you're in TX. In the winter, I saw minimal benefits so I stick with 87. If I happen to be driving past one of the few ethanol-free gas stations in WI, I fill up with that - regardless of the octane.

EDIT:
Also, I agree with her \|/ - at a 40+ cent premium, it's hard to justify the higher octane. But at a 20 cent premium, I don't mind splurging on it in the summer.
 

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When I had my 2012 MK3 SE, I liked to use Premium as it seemed to offer better idle, better feel at take off from a stop. After three years plus I traded in the SE for a ST. Which does much better on Premium.

One issue is the price differential from Regular to Premium. In some parts of the country the difference is still 20 cents. Around here it went up to 40 cents a gallon more. And I hear some places the differential is 50 cents a gallon more for Premium.
 

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Focus Preacher
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One issue is the price differential from Regular to Premium. In some parts of the country the difference is still 20 cents. Around here it went up to 40 cents a gallon more. And I hear some places the differential is 50 cents a gallon more for Premium.
Still it's like what ... a 3-5$ difference with the reg. focus tank of 12 gallon (46L)

Worth it IMO!
 

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#dailydriven
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Well, i cant really compare regular to premium as i've only used premium in the car since i bought it brand new but i will say my car drives great on premium.
 

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Always used premium in my MK3's. When my dad first bought his titanium escape he used regular only and his avg mileage was in mid teens. After I got him to switch to premium it went up into the twenties along with giving its full power.
 

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Rebecca
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I'm tuned so I always use premium.
 

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Always used premium in my MK3's. When my dad first bought his titanium escape he used regular only and his avg mileage was in mid teens. After I got him to switch to premium it went up into the twenties along with giving its full power.
Are you getting additional MPG with premium as well? Wait,you wouldn't even know! I wish you always hadn't used premium so I could have a good comparison!

I've only filled up at Costco (and Chevron twice) regular gas and can get 38mpg during the summer and 36 during the winter. But if I can get that to a 40 during the summer, I'd be stoked!
 

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some places, like where I live, certain stations dont use ethanol in their premium. So with that, i get increased MPG, and on some cars slightly better performance.

i dont drive a mk3, but that goes for any gas engine. ethanol is far less effecient, so filling up with straight gas (if thats the case where you live) will be better mpg.
 
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