User blog comment:Chormira the Autobot/Who's the Fastest?/@comment-115265-20110826080419

Sonic is the fastest thing alive. No living being is faster than him.

Blurr is definitely alive. So he qualifies as being slower than Sonic.

Metal Sonic? He's sentient, but not alive. I don't know his top speed, but there's a chance he might be faster than his organic original.

As a result, I don't think Metal Sonic should be eligible to compete here. He's not alive (which is key, when comparing with the fastest thing alive), and his speed is artificial (as is the rest of him) so he's not fair competition with Sonic.

Blurr, on the other hand, is very much alive, and had his speed the moment he started existing. Not to mention that he was born of natural means, as possibly defined by Cybertronian biology. That said, Blurr's speed is also very much natural, just like Sonic's.