Thanks for posting this info. Free is a word everybody understands.
Even if one has to pay $35 for the return trip, I would have used six gallons of gas at $3.31/gallon. That is approximately $20, so a round trip would cost me $15.
I haven't driven to Orlando in a very long time so I wouldn't know if tolls could be subtracted, from the money saved.
I would also tip, the bus driver. I'm a big sport.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).