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1989GTA,
We ran mostly on 89 octane for 9.5/1 Dart headed motors. On 10/1 -11/1 compression engines we have used premium. I have not tried over 11/1 on the dyno and have not run more than 10.7/1 on the road. I have heard that 11.5/1 can be used when the water temp is kept low (170) on the dyno but I don't know if this would work on the street. Any body got anything to say about that?
DV
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