It gets worse - Hertz EZ Pass
I found a new gotcha recently. Hertz has a toll transponder in their vehicles in a little drawer attached to the windshield. Pull out the drawer, go through a toll, and all automatic....except...
Once you use it at the first toll, Hertz is charging a DAILY fee for the convenience. So if, and in my case, you use it on your first day for a $3.50 toll leaving Boston Logan, and have the car for a week - your $3.50 toll ends up costing something like $25 - because Hertz charge the fee every day, used or not, plus the actual tolls.
When I complained to Hertz they first claimed this was an external 3rd party fee and there was nothing they could do. When I posted my displeasure on Twitter....they contacted me immediately and credited the fee as a "one time accommodation". Never used the transponder again.