It's all magic to me, but I'm pretty sure the font carl uses for Chunga is specially designed to pack as much text as possible into as little space as necessary. As I recall, it's a variant on the font he designed/tweaked for Apparatchik, which also packed a lot of text into a small space and had considerably less white space than Chunga. I've noticed in my own random experiments with the fonts that come with MS Word that different fonts occupy significantly different amounts of territory. I'm pretty sure that Garamond uses less space than Times New Roman, for example. (Although I could be misremembering.)