My wife and I just took our 2002 Prius on a 1387.5 mile road trip from Cleveland, OH, where we live, to Hiawassee, GA this past weekend (4/20-4/22). We drove 6 hours the first day, 12 the next, and 6 the final day. We had no difficulties, were never lacking performance (even in TN and GA mountains), and averaged 49.4 mgp. The trip spanned a large range of temperatures, too, from 37-84 degrees F. We got the car in March from a dealer with 4300 miles on it and have put an additional 3000 on since then. Cannot say enough good things about it. Hope this helps.