How much power is lost in comparison to a prop engine with a jet motor? I know there is some loss, i.e. a 80 hp jet would be comparable to a 60hp prop, but how much is lost? I'm looking at a 40 hp jet mercury (2002, low hours), my question is, would I regret it if I mainly fish smaller rivers, but occasionally get on larger ones like the KS or MO? Increased maintenance for jet motors? Thanks for any input.