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You'll know if you have bad gas more by how the car is driving. If there's a knocking, misfiring, metallic rattle from the engine compartment, then bad gas might be your issue. This will definitely show up more under acceleration and with a rough idle most times. The pic you attached looks normal.

You may feel like you have bad gas if you're running a tune for a specific octane and accidentally put a different octane in your tank.
 

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NjoySTi said:
Is this something you would see with bad gas?
What exactly are you referring to?
 
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