Saving boat gas.

[jrc]

Sounds like you dialed in the right prop. As you know, you want a prop that gets you to the reccomended max rpm at WOT, this should be a little below rev limiter. Any more prop and you will overload your engine and risk premature wear. Any less and you risk over-revving, use more fuel but will have a better hole shot (gets on plane faster).

Did you see as much improvement in MPG as in GPH?

My solutions are all pretty obvious:

Spend more time at anchor. I hate staying at the dock in good weather, so even if I just go out a mile and anchor.

Pack a lunch to avoid driving to the other end of the lake for food. I can't tell you how many times I spent more for gas than food.

Find a sweet spot to cruise. I don't have fuel flow meter, but most boats get the best economy at either idle speed or fully on plane. I avoid running in the plowing zone and running at full speed. In general, the smaller the wake the lower the fuel usage.