I currently have an android phone which allows you to add a Myki card to the wallet, no card fee minimum top up $10.
My trip in the morning is free due to early bird travel (touch off before 7:15am). I only pay for the return trip, 2 hour full fare fare $5.50.
The system allows your Myki Balance to go negative and you can delete the card and add a new card which won't carry the negative balance over.
What's the best possible method to maximise the negative balance loophole?