According to Official Guinness Records,
The largest parade of Scion cars was 535 cars, organized by Scion Los Angeles Region (USA) on a course from Irwindale, California, USA to Knott's Berry Farm in Buena Park, California, USA, on 26 October 2010.
Lauren Lorey adjudicated.
For a complete list of 2010 records, please visit 2010 Guinness Records in United States.