I found this pdf online at Toyota Parts: Toyota Mechanical Parts | Toyota Repair Parts and noticed that when I search for all Prius references in the document, the various model year have different specifications; Oil capacity Curb weight I was looking up part numbers to price compare my upcoming 30k service. 1224 appears to be the regular Prius 1226 appears to be the Touring edition which Prius version would be 1220?
