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Old 04-10-2013, 12:31 PM   #1
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Is Premium Gas ok?

So I've never used premium before, but I've read/heard that its ok to fill up the tank once every month or 2 as it "cleans" the system a bit. I've also seen/heard that it does nothing.

As a focus owner, what do you say?


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Old 04-10-2013, 12:43 PM   #2
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I have a zetec, but I don't imagine the answer would be to different from a duratec... I say it's great, I actually observe about 4-6mpg more with 93 vs 87. I also saw a smoother idle when my plugs needed replaced...

Some argue it's just a waste of money unless you have a tune, but I have observed different...
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Old 04-10-2013, 12:46 PM   #3
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It will likely do nothing.
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Old 04-10-2013, 03:08 PM   #4
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waste of money unless you have a tune.
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Old 04-10-2013, 03:12 PM   #5
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If your putting in premium= get a tune & enjoy the power w/ it.

Quote:
Originally Posted by drummer829 View Post
So I've never used premium before, but I've read/heard that its ok to fill up the tank once every month or 2 as it "cleans" the system a bit. I've also seen/heard that it does nothing.

As a focus owner, what do you say?
If your running premium fuel, Why not take advantage of the power & get a 91-93 octane tune w/ a Steeda sri? Another words= Get a tune
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Old 04-10-2013, 03:18 PM   #6
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Quote:
Originally Posted by felixthecat View Post
If your running premium fuel, Why not take advantage of the power & get a 91-93 octane tune w/ a Steeda sri? Another words= Get a tune
is there really worth it with just a steeda sri? in other words, will i notice a difference and where would i feel the difference at?
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Old 04-10-2013, 03:35 PM   #7
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is there really worth it with just a steeda sri? in other words, will i notice a difference and where would i feel the difference at?
All around= low & high end. Have them turn off the rear 02 senser & egr. Do a bsd too.
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Old 04-10-2013, 03:59 PM   #8
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won't hurt anything,just make your wallet lighter. I ran it for two months didn't see any difference in mileage,MIGHT have made the engine run a little smoother,but that could have been my imagination.
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Old 04-10-2013, 04:02 PM   #9
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I'm guessing the ECU isn't aggressive enough with timing and a super sensitive knock sensor to adjust for a higher octane. I'm pretty 95% sure it's a waste of money. Some ECU's will advance the timing until the knock sensor indicates knock, and will stay right on that fine edge. I know the 2011+ Mustangs do it. I doubt the Focus Zetec/Duratec ECU is that sophisticated.
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Old 04-10-2013, 04:38 PM   #10
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Quote:
Originally Posted by felixthecat View Post
All around= low & high end. Have them turn off the rear 02 senser & egr. Do a bsd too.
Which tune would you recommend. I've seen many people rave about toms tune.
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