Just cruising down the hwy listening to the oldies radio... I notice a truck in the rearview way back coming up faster than me, as a courtesy I move into the slow lane. Closer I see It's a really clean GMC 2500HD maybe a 2013 model with probably the 6.0L engine? We're rolling around 60-65 he gets ahead, I return the favor passing him. He passes me then I see smoke from his exhaust... he is hammer down trying to gap the old man! If we wouldn't have run up on traffic, I would have said bye bye, the old man is coming through!