I have done 6 hours in a WW2 with the tank, but that was at .72 reducing to .70M. Any headwind and you are better off just pumping gas out the back and landing halfway. The 2 will go .76-.77 as long as you don't want to go high.
5000 feet fully loaded? It's been a while but I don't think so especially at any altitude above sea level or warm temperatures.. On the other hand a light WW2 is a pretty good short field airplane. There is a pretty big difference between the 1 and 2 in performance.