I have a 2000 - 1900 Lund Pro Sport, with Yamaha F100 4 stroke. Two guys and full tank ... 34-36 flat water. Thinking of getting a bit larger boat, 21-25 ft. Friend got one last year, 23 ft. with I/O, and it fishes great. I don't do much shallow water fishing or small lake jumping anymore. Kids are grown, And it's been great to fish out of bigger platform, without getting beat up in rough water. I can't seem to get strong opinion on I/O vs. OB (4 stroke). While my F100 sips fuel, my friends I/O seems to gulp it. Any thoughts???