I’ve tried to search but can only find average and overall mileage. How much does mileage drop when going off road? I’m doing the White Rim loop in Moab UT in a few weeks as support for some mountain bikers doing it in one day. It’s a bit over 100 miles. Basically old mining road with around 8000 feet of elevation change down then back up with some rock and sand sections. I’m wondering if I’ll need to carry extra gas.

