Not sure which of the 3.3 engines you have, but it seems to me that you could use a lot more power. I am towind a 21' travel trailer with my 06 and it slows down a lot on the hills. It also eats gas. If i stick to around 55 and it is more or less level out I can see 11, but with hill I have been down as far as 8.1 mpg.