According to Mark Lockwood's Basic Texas Birds: A Field Guide, with or without Wile. E. Coyote chasing it, a Greater Roadrunner can reach speeds of 20 MPH (32 KPH) while a Coyote can reach speeds of up to 43 MPH (69 KPH)
So really, it should have been over the first cartoon.
I will try and forget you just said that.