We did a circle tour some ten years back starting in Brimley, through GM, Baraga, Iron River, Manastique and back to Brimley in 5 days. I think the total was around 1100 miles and we averaged 200-300 miles a day. We also had a retiree following with a chase vehicle and trailer. As it turned out we needed him with one blown ZR in Munising (big surprise) and a smashed Storm in Sidnaw. We waisted a bit of time with each breakdown but not nearly as much had we not had the chase vehicle. We had reservations at each nightly stop and managed to make it to each before sunset. Three of us six had different maps downloaded to our Garmin plus-III and had no issues finding our way. Well, except for the short detour through Wisconsin for an hour or so.
We payed for the retiree's room every night and it was well worth it. It was a blast and I wish I had the time to do it again. Enjoy!