User blog comment:Maki Kuronami/Lesson 15: Faunus and Robots and Reveals... and Burne and Joel./@comment-5217560-20131101020721/@comment-3146930-20131101034844

Also on an episode of Death Battle, they managed to calculate Rainbow Dash's top speed at being around 7600 mph (Mach 10), which is 5 times faster then the speed of sound...so if Sonic can travel at the speed of sound, he still ins't the fastest thing alive.