I just bought a 2009 GMC Sierra 2500HD 6.6L Duramax pickup truck. It is blue.
No, really. Here's a picture.
Figured it wouldn't hurt to know exactly what they call this color, though, just in case I need to buy touch up paint or something.
Stealth gray metallic. Paint code 928L.
Seriously. That's a gray truck. If I were in Canada it would be grey. Either way, it apparently isn't any sort of shade of blue.
Either way, it's a really nice truck. It just isn't gray.