Yet another resource for all-inclusive car rentals in Ireland: https://www.newway.ie/. I only know what I've read through a thread on Tripadvisor, and we know how unreliable those reviews can be. I'm going to Ireland in May, and I'm sticking with Conn's which was my go to website for all-inclusive rentals in Ireland before the pandemic. Nevertheless, newway.ie seems to have competitive pricing for my dates and is affiliated with Avis as Conn's is with Hertz so if you lean Avis, it might (and I stress MIGHT) be worth considering.