We’ve rented a lot at DIA because our son went to CU at Boulder and now our daughter lives just north of Denver. We usually rent from Thrifty and they politely told us about the E-470 and the transponder. I did some querying and they told it was a daily fee whether we drove on the road or not that day. So we declined, drove down to I-70 and then up CO-36. We may have spent a few more minutes in the car, but saved about $20 per trip that way.
I drove the tollway past the Denver airport and got a letter in the mail for the toll of a few dollars. That was at 4 in the afternoon as I headed north.
I sent them the payment and a few weeks later got another invoice. That one was for about 6 pm that day as I headed north. I called them and complained about why one day of tolls wasnt combined. No clue from them. Real pain writing two checks, two stamps etc. Then they tried to sell me a pass.