We just finished Mystery at the Museum. We live in Montana with lots of miles and relatively few caches. We started in '01, so we have pretty well cleaned out anything close (~100 mile radius). We used a Nuvi to track our mileage - 1133 miles, 60-70 gallons of fuel, and three big bags of sunflower seeds. No complaints other than the let down of looking forward to solving the case only to find out we needed to find another 35 caches. It felt a little like an old "bait and switch" scheme.