I had a couple quick questions about I/Os vs. outboards. I've read up on outboard fuel consumption, and from my own observations, it seems that an outboard will burn approximately 10% of the rated HP in gallons per hour (GPH) at WOT. So does this hold true for an I/O? Or is the fuel consumption closer to that of a car with a similar engine? How much difference in consumption could I expect between a 4cyl and 6cyl? I understand that a good deal of this depends on a hull design and shape, but for comparison we'll say that they are all attached to the same hull. Thanks for any input you have.