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Old 09-06-2013, 09:42 AM   #21
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Originally Posted by DrkKnight614 View Post
And I believe the power ratings for the engine were done on premium gas. I remember reading something that said expecr slightly less performance when using regular, this was as per Ford. So even without a tune, you can run premium in 2012+s
I would assume so, since the owners manual recomends the use of Premium Fuel.

I think everyone forgets this thing has 12:1 compression ratio...
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Old 09-06-2013, 10:40 AM   #22
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And I believe the power ratings for the engine were done on premium gas.
I don't. If anything, the 87 octane dyno results that have been posted here on FF show that Ford underrated the horsepower slightly, considering estimated drivetrain losses.

It hasn't really been proven that higher octanes improve performance or efficiency an appreciable amount with the stock "tune". But, any of us who use them will tell you that the drive-ability of the car is much better with higher-octane fuels.
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Old 09-06-2013, 10:41 AM   #23
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I would assume so, since the owners manual recomends the use of Premium Fuel.
My owner's manual doesn't recommend premium. It recommends using no lower than 87 octane, and states that performance will improve with higher octane ratings.
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Old 09-06-2013, 12:26 PM   #24
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I don't. If anything, the 87 octane dyno results that have been posted here on FF show that Ford underrated the horsepower slightly, considering estimated drivetrain losses.

It hasn't really been proven that higher octanes improve performance or efficiency an appreciable amount with the stock "tune". But, any of us who use them will tell you that the drive-ability of the car is much better with higher-octane fuels.
Have you driven a MKIII with 93 octane and a stock tune during warm weather?

It's a HUUUUUUGE difference in this Texas heat.
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Old 09-06-2013, 02:42 PM   #25
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Have you driven a MKIII with 93 octane and a stock tune during warm weather?

It's a HUUUUUUGE difference in this Texas heat.

Yes, I have, and those are the drive-ability improvements I'm talking about. They are very noticeable.

Note that I didn't say there is no performance increase--I said it isn't proven. Meaning, I've not seen dyno numbers that show an appreciable increase in HP with 93 octane vs. 87 with the stock tune.
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Old 09-06-2013, 03:18 PM   #26
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....Seriously?

That's as bad as saying you can't prove your refrigerator is working or not without a thermometer. The difference is night and day.
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Old 09-06-2013, 03:38 PM   #27
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....Seriously?
Yes, seriously.

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That's as bad as saying you can't prove your refrigerator is working or not without a thermometer. The difference is night and day.
No, it's actually more like I can't tell you if the refrigerator #1 is as cool at 43 degrees as refrigerator #2 is at 38 degrees. It definitely feels like #2 is cooler, and milk lasts longer in it, but I can't prove that it is without a thermometer.

Again, I can tell you for sure that drive-ability is definitely much better (mostly low-rpm torque) with 93 octane, and that's why I always run 93, but I can't prove to anyone that max horsepower with 93 octane is appreciably greater than 87 without a dyno.

Perhaps you can explain to me how you can prove that without a dyno? Or are you just going to tell me it's obvious again?
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Old 09-06-2013, 09:20 PM   #28
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Yes, seriously.



No, it's actually more like I can't tell you if the refrigerator #1 is as cool at 43 degrees as refrigerator #2 is at 38 degrees. It definitely feels like #2 is cooler, and milk lasts longer in it, but I can't prove that it is without a thermometer.

Again, I can tell you for sure that drive-ability is definitely much better (mostly low-rpm torque) with 93 octane, and that's why I always run 93, but I can't prove to anyone that max horsepower with 93 octane is appreciably greater than 87 without a dyno.

Perhaps you can explain to me how you can prove that without a dyno? Or are you just going to tell me it's obvious again?
Well, the car chirps the tires on hard shift with 87 if I make it. If I push just as hard on 93, the car will turn them over for a second or two.
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Old 09-07-2013, 07:55 AM   #29
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Anyway, back on topic... 93 is nearly always only 30 cents more in my area, so I guess I should consider myself lucky. The price changes are slower than with 87 though, so there's a little variability in that figure.
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Old 09-10-2013, 10:44 AM   #30
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While the gas producers post multi billion dollar profits
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