Board Thread:Game Discussion/@comment-28401107-20170217171045/@comment-26829117-20170217193833

You used to be able to run the Double Fame Bonus offline but people discovered that if you stayed offline then you continued to get the double fame bonus after it expired until you went back online. You couldn't stay offline for more than 24 hours (I forget why but daily bonus is probably the reason). Obviously FM didn't like this and so stopped double fame bonus from working offline. You can still race double fame bonus offline to avoid having TSM and Team bots in your races by starting the race offline and going online before the end of the race to collect the bonus.

Having said that, I can't remember the last time I raced offline. I farm EK during double fame bonuses rather than EC so I don't have to worry about TSM and Team bots so much.