Regular 87 octane is fine.
The 2006 Toyota Sienna runs on regular unleaded.
Toyota Siennas produced from the model years 2004-2006 have a fuel filter that's integrated with the in-tank fuel pump. The filter does not require periodic replacement.
WHERE IS THE LOCATION OF THE FUEL FILTER ON A 2001 TOYOTA SIENNA
The 2008 Toyota Sienna runs on regular unleaded.
The 2009 Toyota Sienna runs on regular unleaded.
The 2011 Toyota Sienna runs on regular unleaded.
The 2001 Toyota Sienna runs on regular unleaded.
The 2002 Toyota Sienna runs on regular unleaded.
The 2010 Toyota Sienna runs on regular unleaded.
The 2005 Toyota Sienna runs on regular unleaded.
The 2003 Toyota Sienna runs on regular unleaded.
The 2004 Toyota Sienna runs on regular unleaded.