Thinking about dumping the cata-canoe concept and going with an Aire 16' expedition cataraft. Looking for suggestions on good motor to utilize for occasional power during a couple month long float trip down the Yukon. Boat will be loaded at about 1,200 pounds. Not interest in going upriver, mostly to take a break from rowing when there is little current and when crossing becomes necessary. Obviously fuel economy is a major concern. Any thoughts most appreciated.