curious weight question

[auditude at cox.net]

Dave Aukerman aukdav at ccsdana.net wrote:
<<
Been running this around in my head lately after seeing some strange weights readings on cars.
Looking at a difference between shipping weight and curb weight.  Something in the range of 400 pounds.  Why is this?  Fuel could only make up a portion of that.  Where's the rest?
Thanks,
Dave>>

That does seem like alot of weight, but according to this site, it could only be from fuel and fluids if they are using consistent terms.