Superman Vol.2 #191
Superman speeds along the desert floor, pushing faster and faster, but still not faster than the Flash. The two heroes stop, and Flash tells him that if Superman was the fastest man alive then he would be out of a job. Flash does comment that Superman has gotten faster since the last time they did this. Flash asks why he suddenly has the need for speed, and Superman tells him that he feels like Metropolis has changed so much, and he's been left behind. Superman thinks it's important for the heroes to train each other and improve their abilities. Flash just laughs and asks what they could learn from him, considering he's godlike. Superman stops him, and asks if that's really what they think of him. Flash says yes, but in a good way.
Estimated Condition: VF/NM