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Old 12-11-2009, 04:27 PM
kcslc kcslc is offline
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I'd agree with most everything said so far. Running a lower octane than recommended will increase your chances of pre-ignition (aka detonation, knocking, pinging). Your truck has a knock sensor and if knock occurs will recognize this as being damaging to its longevity and will retard the timing appropriately to compensate. Retarded timing will equate to lower power and I would assume less efficiency. What does this mean in plain english? Run a lower octane and watch your mileage. If it decreases a noticeable amount step back up to the recommended octane.
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