Join Date: Jan 2009
Location: NE Illinois
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When your gas level is low, fill up with high-octane gasoline. If the sound improves, that will be informative. The vehicle should not knock with regular. Maybe some failure such as the knock sensor failing makes the computer not retard the spark to prevent knocking. So this should be repaired.
Actually, based on your description, this is probably not the situation. Knocking usually occurs under heavy load, such as climbing a hill. Normally going to a lower gear reduces fuel knocking.
This may be something, such as a heat shield, rattling.
2009 V6 4wd Base