This is an interesting thread.
Comparing a trip last month via interstate hwy to CT. @ 65 mph, and an recent trip via 2 & 4 lane "55 mph" roads to Harpers Ferry WVa., I think that my truck worked much less this time, even with steeper hills. It just seemed to glide along with no effort, and much less downshifting, albeit I did run with OD off for part of both trips in the hillier (sp) areas. I had already contributed the more relaxed mechanical effort to less wind resistance. Just imagine if you had to push all of the air that a larger RV does.
Chap
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