The top speed of a 6-cylinder Dodge Charger varies significantly depending on the model year and specific trim level. Dodge doesn't typically publish top speed figures, and even if they did, real-world top speed is affected by factors like road conditions, tire type, and even the weight of the car and its contents.
However, you can expect a 6-cylinder Dodge Charger to have a top speed considerably lower than its V8 counterparts. Expect a top speed in the range of 120-130 mph, but this is just an estimate. Reaching that speed would also be unsafe and illegal.