Wow - 9mpg? Off topic, but with the aerodynamic upgrades and cylinder deactivation technology, figured an '07 would be in the double digits.
My experience earlier this year on a fairly lengthy tow of my 185 Sport (4.3L) was an average just over 16mpg in an '02 Tahoe 5.3 by keeping it below 65...
Hope you're able to get your new boat out on the water soon -- know several of us are looking forward to your review. The Mrs. and I are just getting started in boating and the weather is starting to cooperate here, and these Piranha propers look like great spares/upgrades. My only concern about...