I have not owned but have driven for work the Scion XB. A company I worked for in the past had the "toaster" as we affectionatly called it. It looked like a toaster and on hot days if you needed alot of acceleration to get up a hill you needed to turn off the air conditioner. Not sure if this was a normal occurance with the XB but somthing the boss informed me of and didint seem to be too concerned about. We did have a fantastic full wrap on the vehicle to make it look like a billboard and less of a toaster.