I have managed Sams so far from Tellico to Tulsa and are now changing tires and getting the Touratech shockers re-calibrated so have North Oklahoma next. There is some pavement but nowhere near 80%. I have added additional pavement to get fuel and to stay at hotels but nowhere near 80% so far .. I guess less than 50%. The non-pavement tracks are a bit of a zig-zag and make the route longer than if you complete it using pavement and some times you ride 20 miles to cover 3 miles of possible pavement distance for the same start and finish point so this is my only moan at the moment. I am not sure and maybe Oklahoma onwards may be more pavement than NC, TN, Miss, Ala, and Arkansas but the pavement, unless you chose to move off the gravel, was less than 80% for sure. It may not be really tough riding and yes there is some flat gravel but it is a long ride and to do only tough dirt then you may as well stay on BDR's. The weather makes it harder ..