I did one last year and drove to the BS of Michelstatd which is ECACTLY 75 km from FRA. I was over with like 10 km after making some mistakes with exits, and it felt like I'm throwing out Euros with every km overage.
I wouldn't do it again anyways because I just hate the Porsche, it's fast but it sits very low and it's extremely small. The gas included was a great benefit though. Was good for the thrill.
I did it without LH F. Was on UA F.