* Regular unleaded gasoline: This was the most common fuel type for the Avenger's engines.
* Premium unleaded gasoline: Some higher-performance engines (if available for that year) might have *recommended* premium fuel for optimal performance, though they might not be *required* to run on it.
It's best to check the owner's manual for the specific fuel requirements based on the engine in your particular 2010 Dodge Avenger.
