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87. Only 87. Nothing but 87! After going through this problem with a truck I had, I learned a lot about octane and the myths associated with it.
Chrysler for a few years engineered an engine that pinginged as part of its normal operation. They called it "the sound of economy", or something like that, because it was due in part to how lean the engine ran. The Pro ain't supposed to do that, though, and it can quite damaging to the engine. Here's some reading on the topic FYI:
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