How fast do you run? I try and stay between 60-65 and do try and keep it from downshifting going up the hills. I never use the cruise, it always wants to floor it. When I came up your way for the Duck Cup, that was the longest trip I have take it on. 6hrs each way, spent about $400 on fuel. We usually only travel 3-4 hrs for most of the places we go.