Question: can knuckles run as fast as sonic?
Answer: While this technically isn't "something Knuckles can do," it is an ability that he has. ... As a matter of fact, the rate of Knuckles' strength is equal to the rate of how fast Sonic can run. Because Sonic can run between Mach 1 and Mach 5, that would mean that Knuckles can effectively lift between 100 and 500 metric tons.