I like a mix of space's and tab's depending on if my line number is divisible by 3 or not.

2 1/2. Obviously you're using an editor that can do half-spaces?

Of course! I simply type one in with a half A-press.

For those who don't know the reference: https://www.youtube.com/watch?v=kpk2tdsPh0A. It's definitely in the hacker spirit.

En Space: U+2002

Not half, but thin. https://en.wikipedia.org/wiki/Thin_space

2 or 4