I rented a car with Budget in Denver in June. The cars there have a transponder for the toll road (E-470) which I used driving from DIA to Lafayette. They charged me $7.00 for the tolls which showed up on my credit card at the same time that the rental itself did.

By the way, as far as I can tell from the E-470 web site, the tolls should have been $6.50 but it's a bit late to quibble over that.

Now, 4 odd months later, I got a credit card charge from Budget for $2.50 in tolls. I haven't rented a car with Budget since then (and, in fact, for other reasons am unlikely to do so). I'm taking this up with my credit card company, but I'm wondering if anybody else has had this happen.