I have had discussions in the past about this.
I am sorry that I do not have the name of the person that asked me about this last week.
On 25-12 DBDW the free ride frequencies are:
1st Level 2nd Level 3rd Level
Single Play 8.4% 8.1% 8.1%
Five Play 8.44% 8.05% 7.85%
I got this from the pay table help screens of these games at the Majestic Star (Gary IN).