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Old 12-11-2009, 03:27 PM
kcslc kcslc is offline
Dodge Ram Forum Junior Member
Join Date: Oct 2009
Location: Utah
Posts: 39
Gender: Male
Vehicle: '09 Crew 4x4
Trim Level: Laramie
Color: Black
Engine: 2009-2010 345ci (5.7L) Hemi V8 390hp 407lb/ft
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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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