[THEFERMANATOR]

You will not double your milage unless you troll ALOT, and I do mean ALOT! The fuel economy diffetence for long runs is no where near as much as most think it is. At idle to low load situations, yes, you will see a big jump, but at cruise to wot the realistic improvement should be in the 10-25% range of improvement. I currently havea 4 stroke because that is what was on the boat I found I liked, but I would have just as easily have gotten one with 2 strokes. If you're after mpg, then a direct injected 2 stroke will most likely beat out even the 4 strokes in most areas.

As to hating the smoke, have you tried a better quality oil like pennsoil synthetic blend? Yamalube is a good oil, but I had the least amount of smoke with the pennsoil. Also make sure the oil injection pumps are adjusted correctly. Even 1 turn out of adjustment can make the difference between smoke or no smoke. I had a 25HP Suzuki YEARS back that fought me fouling plugs, ended up being the pump was 2 turns out of adjustment. It actually fell within theallowable limit, but adjusting it dead on cleared up all the smoke and no more plug fouling.