I try to plan for 400 miles a day. Never seems to work out that way ... seems some days are 500 miles and some are 300 miles ... so on average, 400 miles seems right to me. Lots of stops along the way. (More and more they are rest room stops ... old age ain't for sissy's) I also plan a meal break somewhere in the middle. getting off the ride seems to keep me ALERT ... and that is the name of the game.