Thanks overdrive75 very good advise. It indicates exactly what I am thinking.
Saw the E450 Winnebago again today. It would solve some problems that we have while traveling. That is why it is so attractive. However, I am not sure how much I will be able to use it.
Gas mileage is a factor in my decision and I appreciate all the responses I have received, but it is not the only or even the main concern that I have.
It is something that will work itself out over the next few weeks. I won't rush the decision. I do enjoy my Roadtrek.