89 mustang 5.0 - Ford Powerstroke Diesel Forum
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Old 08-12-2011, 06:10 PM
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89 mustang 5.0

Ive been running just regular 85 fuel in my 5.0 and was wondering if i used the 93 would it run better because its been a little lagging lately. Thanks for any help
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Old 11-04-2011, 03:25 PM
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Octane is the resistance to detination. So if you have no ping, not really.
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Old 11-04-2011, 03:33 PM
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What is your location? 85 and availability of 93? I've seen 85 at higher elevations, but only up to 89-91. How bout new plugs and some fuel system cleaner?
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Old 11-04-2011, 03:37 PM
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Haha. I didnt even notice 85. My mind thought 87. Yea, 85 your timing would need to be really retarded (like 10-11*) on a stock 5L.
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