From Conky PitStop

Using Vnstat

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After installing vnstat you have to create a database for it to work from:

sudo vnstat -u -i eth0

(change eth0 for your network interface)

First time you run it you’ll see:

~$ sudo vnstat -u -i eth0
Error:
Unable to read database "/var/lib/vnstat/eth0".
A new database has been created.
~$

The code that produced the image above: vnstat-code.txt.tar.gz

Update: 20 Sept 10
Using:

short_units yes
pad_percents 2
TEXT

to line up the decimals with vnstat doesn't work.

Maybe, someday, someone can do something about this.