Just got 100% on this. Playing through those 25 gang war missions, one made me laugh: The rival gang is ensconced in an oil refinery or chemical refinery or whatever it is, lots of storage tanks and stairs. My gang and I dismounted from our bikes, and got into shootouts with the bad guys. Eventually, I chased the last of them up 3 or 4 stairways, up onto the catwalks. When I'd finished the mission, I descended down a stairs, only to discover that one of my guys had followed me up to the 3rd level ON HIS BIKE! I laughed out loud. "Dude, what are you doing?"