The 2004, 2005, and 2006 Prius are identical in regards to emissions ratings.
However, depending on your state (when/if they have accepted the CA emissions standards), the same Prius may be listed as a cleaner vehicle than the federal standard. Each year some new states adopt the CA emission standards for the upcoming model years, so it is possible for a 2006 Prius to be listed as cleaner than a 2004 in your state, even though they are the identical vehicles (just classed differently).
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