The low hp 4 strokes are definitely far more fuel efficient than their 2 stroke cousins, esp. at trolling speeds.
I can pull the fuel disconnect on the 6hp at idle and it'll sit there and putt away for twice or more what a 2stroke will do.
Also the conveinence of no oil in the fuel is great, its great to just put in fuel, check engine oil and go and you're good.
That said, while I'd love to throw a 4stroke onto my project 16 or 20 foot plywood skiff, I'd rather have a back left after pulling it once. So I'll go with probably around a 25hp 2stroke merc. Which weighs about the same as the Honda 10hp's.
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