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Just bought a 2001 mustang gt that has a hypertech (#41005) tune. I can't locate the origional owner who had this done so I have no idea what octane I should be using and hypertech isn't open on the weekends and I need gas. Any help would be appreciated.
 

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I would get just enough of the good stuff as you need to make it through the weekend and call hypertech Monday.
 
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