Just looking at the Insight service manual and was looking for any changes related to the 2006 model. To my suprise, I noticed that the entire fuel system is new for the 2006 model. Most of the system is the same from 2000 thru 2005 with some minor changes. The 2006 appears to have a new tank shape, an entirely new evaporative emission system and new fuel lines. My hope is that if Honda spent the money to redesign the fuel system, maybe they would like to spread their redesign costs out over a few extra model years---like 2007, 2008, etc.