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Gary, my Supersport 15 arrived at my door with the 1989 Johnson 70 mounted all the way down, and turning a 13x17 SST prop. I bought a decent, newer stainless prop (13.25x17, but with a lot more cup which effectively adds pitch) and raised the motor two holes. The top speed went up, and handling got quite a bit better - less bow lift when taking off from a dead stop (an issue for the 15 / 70 combo, believe me!) and in general, a lighter feel to the steering. I did not measure the mileage to any great accuracy, but it did seem to improve. One additional benefit was an inch and half of extra skeg clearance when moving the boat around on the trailer - it made a lot of things easier!

That said, this was a 15 which didn't have any problem with the splashwell drain holes.

Tim