Ford Mustang Forum - View Single Post - What octane are you using in the GT?
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post #10 of (permalink) Old 06-24-2010
Kjanks
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Well I just filled up for the 2nd time at 87. I am going to test this again for the second week. Gas mileage is still up in the air since I have been hot roddin it a little and then taking it to shows and everywhere i go and then driving to work. i am doing my last 87 round this week. then i am switching to the premium grade. we will see if there ia a difference that i notice.
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