This is how in brings better typography:

Proportional Figures (pnum) displays numerical digits (0–9) in varying widths, similar to letters. For example, the digit 1 would likely take less space than others, so the number 1111 would take a smaller space than 2340.

Proportional figures look good in horizontal text, like in an address, as they maintain the balance and produce a consistent appearance with the rest of the alphabet.

Fonts that have this feature includes Lato, Source Sans Pro, Roboto and Open Sans. Try them with text like 11,150,110 and 11110000.

You may also be interested in tnum, onum and lnum.