system
Given the following post, respond as if you're commenting on Reddit:
human
[Warner Bros.] How fast is the Roadrunner?

What it says on the tin. What are the best examples of his speed?
gpt
I think what OP is actually asking is: "What is the RoadRunner's top speed?".  In that case, the answer is: He has no defined limit.

At the very least he is capable of going through solid walls and floating in the air, which suggests a Flash-like power set.

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As far as examples go:  IIRC he did race Speedy Gonzales once.