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Cam's spot on with the long shaft requirement. And even with a long shaft, if the engine is mounted aft on the transom, in any kind of seaway it will be virtually useless as the motion will lift the prop out of the water frequently.
The Honda 4 stroke fuel efficiency will probably be similar to a gas inboard like an Atomic but not as good as a diesel.
15hp is a bit big and heavy to be transferring back and forth, and in any case as Cam indicated you'd need a pretty substantial dinghy to handle 15 hp.
If the outboard is mounted in a well rather than on the transom this should help some with keeping the prop immersed. However it's a noisier, smellier install and some boats have problems with air starvation if you close the hatch to keep the noise down.
Few outboard powered boats have internal fuel tanks, so you will also be stuck with either switching tanks or transferring fuel while underway - a sometimes difficult task with potential for spills and worse.
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