Happy to share gas stops and points of interest if I have a rough idea of your trek. We base out ”by” Buckhorn and make our week between Big Springs, Republic, Big Bay, Grand Marais, Seney, McMillian and Tfalls.
My suggestion might be from L’Anse to Negaunee, fuel and get on 8. Take 8 through Marquette to Gwinn, fuel. If your fuel allows maybe past Gwinn to Trout Lake, fuel -food. Continue on 8 to Eben. Eben take roads for about 1 1/2 miles to Eben Falls parking, then hike. Get back on 8 to 7 to Buckhorn, fuel (food if needed). 7 to 411 to 2 back to 7, spur to Big Springs. Food and fuel at Big Springs Tavern. From there to Jack Pine (2 to 41), food and sometimes fuel. If you fueled at Buckhorn you should have no problem making it to Stuben off 41 north of Jack Pine to fuel. 41 to 8 outside Shingleton. Slightly north on the intersection of 41/8 is Tanglewood (food/fuel). Get on 8 west towards Munising/Wetmore get on spur 422 to Miners Castle. You can either go back to 8 or just before train crossing), there is a groomed trail along M28 to Wetmore leads directly to food/fuel otherwise on 8 take Spur to gas in Wetmore. Either go through town of Munising or get back on 8 to 8/7 (Buckhorn intersection). Continue west but take 7 to Christmas. Christmas food and fuel. 7 to 418 to 417 along the lake. Fuel available in Autrain. Stop at Lakenland sculpture park on 417. Moving on there is a trail by a bridge in Harvey that is groomed to fuel. Harvey trails are monitored by PD so maintain speeds and stay on trail! Once you get to outside Marquette you can stop at Marquette mountain. Link up with 8 and return how you want to L’Anse.