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Old 09-29-2013, 08:17 PM   #41
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Old 12-21-2013, 01:44 AM   #42
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must be because yours is a 2013 and the computer can adjust. I ran 93 for 2 months last year in my 2005 just as an experiment,no change in power or mpg's.
I tried 93 in my 2005 ST and also no change. Then I put in Autolite 103 plugs - big change 1st gear pulls much harder. Later, I tried 93 again - big difference again - all gears rev much faster and smoother. It's a different car now.
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Old 12-21-2013, 06:46 AM   #43
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103's did have an effect on power,but it didn't seem to make much difference if the fuel was 87 or 93.
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Old 12-21-2013, 08:20 AM   #44
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I tried 93 in my 2005 ST and also no change. Then I put in Autolite 103 plugs - big change 1st gear pulls much harder. Later, I tried 93 again - big difference again - all gears rev much faster and smoother. It's a different car now.
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103's did have an effect on power,but it didn't seem to make much difference if the fuel was 87 or 93.
If your using 91-93 octane fuel= add a tune to take advantage of it.
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Old 12-21-2013, 09:21 AM   #45
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I paid under $2.80 for 85 in my 4Runner and the Focus' premium fuel fillup was right at $3.01/gal.

I'd like to see a dyno chart showing a diff between the octanes and see if we're actually making noticeable gains since octane doesn't make horspower it's just the higher octane is more resistant to detonation. I notice a bit better throttle tip-in and a little better MPGs on my Focus but I doubt I'd see a diff in say the 1/4 mile consistently and maybe a tenth at best.

in my STI I obviously have to run 91 but if I go put 101 octane race gas there'd be zero diff unless I raise the boost (sport sharp mode adds a few more psi) which is the only reason I'd run higher octane but really just for track duty.
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