I can do up to 400 miles in a day if the Interstate traffic is great and the wind is not a factor. On days with a 30 mile/hour cross wind 200 miles is about the limit.
Going to Disney in Ft WIlderness from Long Island, NY, I did push it down the highway and did a 500 mile day. Thats a big day and I was itred afterwards. Otherwise I stop driving at around the 8 hour mark and thats how we plan our over the roads around 350+/- miles depending on traffic clogs.
John, Lisa & Tara
2001 2500LT Suburban 8.1L 4x4 Autoride K/N, AIR HORNS
Reese 12klb w/dual cam, Prodigy, 27x Wilderness BH Trojan 125's, Honda EU3000, Dish 500, Xantrax 1200, Wilson Cellular Ant & Amp, L.I.B.B.A. #1747, Wireless WiFi, Water Camper