I just know I don't tell my wife what it cost to fill up and I don't have problems because she would freak out if she knew.

It's a good idea to burn as much as you can, you end up with a larger fuel tax refund check in the winter that way! It's like a savings account. :lolhit:

on a 42' guessing about 1 mpg at a slow cruise 1/2-3/4 at wot with big motors

I do some bean counting myself...but never on my boat! FPG is my concern on the lake.

The only time i think about fuel is when I am wondering if I have enough to get to where i am going? ...and the answer is usually, no.

on my 42 with 557s 871s 4 1050dominators i never checked miles per gallon , pin the sticks and listen to the whine.