I believe that the biggest threat is heat. Higher octane generates less heat. That's why a lot of those 3800 guys run cooler t-stats (sometimes drilled) and 104 plugs. If you're not rodding the pi$$ out of it you probably won't have any problem. Remember that when you run regular gas, KR goes up and power is enormously reduced by the PCM.
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Alan
Tomorrow is often the busiest day of the week.
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