I don't think locomotives should be run on coal.
I think a small boat I build should. I think a camping generator (if one wants one) would be fun to run on twigs and pine cones.
I eat one sandwich for say 6 hours on the water. Since I'm usually fishing it depends on how far the fishing grounds are away, or if I'm trolling or casting or anchored. I can row 3 mph steadily when I'm moving to a spot. 4 mph is sprint speed. I have no problem covering a couple miles to get some place I want to fish.
I once rowed across Lake Champlain from Burlington, Vermont to Essex NY, I believe about 13 miles, in 3 hours, just to do it one Sunday morning. I had lunch afterward. I'm 75.
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