Too many gang encounters, ammo has no other choice but to be plentiful.
Sometimes less is more, gangs should have less members, and every member of a gang should be a memorable character and treated as a mini boss. For example in the movie Robocop (1987) Clarence Bodicker gang only has five members for the entirety of the movie, but they still gave Robocop a hard time, the movie The Crow (1994) same thing happens, a small gang but memorable and challenging.
The story, characters, lore would be richer, and counting bullets would really mean something.