[Superman]

First, clean glass is hard to fog. I mean really clean. If it's really clean, fog has a very hard time forming. I live in a rain forest, by the way.

Cool air seems to work better than heated air. Later, heated air works well to warm up the glass and prevent fogging later on in the drive. But in the first fifteen minutes, your best bet is probably to not direct heated air past the glass. Only cool air.

And yes, cracking a side window makes a huge difference. It draws considerably more air past the glass.