" You may find something that always gets 15mpg, both towing and not, but that is comfortable and has adequate power. "
I agree with Roger's comment here. We towed our Scamp13 many thousands of miles with a 6 cyl. Mazda MPV. It worked great (as long as we were savvy about weight) and we got 15+ mpg when towing; without the Egg we averaged 24 mpg. The MPV labored a bit on steep grades, but we managed with gearing down, etc.
As the Mazda (like us) began to show it's age, I lobbied hard for a full-sized van made in the USA. I had one for my commercial cleaning service years ago and loved the cargo space. Since we full-time in our Scamp
, packing our life with us on the road, a tad more space was desireable. However, DH was askeered of that big V8 for fuel 'non-economy'.
Fast forward to June - Alert the media ... we did buy a slightly used Ford E350
Had searched everywhere for a used E150 ... not to be found, and this deal was too good. So, now we have "Overkyl" and I'm not afraid of hills anymore !!! But the very BEST part is ... we only dropped about 1 mpg towing with this new tug, which pleased DH no end. The flip side, of course, is without the Egg, we STILL get only 14 mpg - oh well. He has also come to love that the back of the van is now orderly and neat, no longer resembling the Clampetts on their way to Beverly Hills
The seats are comfy and we're not bothered by the 'truck-like' ride or handling. So far, so good.
Bottom line - it isn't fun if it isn't comfortable. Good luck in your search - life is a 13footer is terrific! L 'n D