Wireless-enabled and more…

So today I spent the day at the office, as usual, and I completed X amount of work.
After leaving, instead of going home, I stopped at a nice wireless-enabled cafe and continued to handle issues from there, emails, VPN, etc.

I feel like in the three hours I spent there I completed X+40% more work in a much shorter amount of time.

What does this mean? That I am more productive away from the office than actually when I am there?