Quote:
Originally Posted by Kracken
The boat weighs 3600 + 3 occupants. One is the wife and one is the 5 year old so that is like 3600 + 2 occupants. (just in case the wife reads this).
Anyways the engine is 5.0 MPI. 250HP.
I must be calculating wrong.
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Here's how it's done. Get an Hour Meter and have it wired to the ignition switch..or however the meter manufacturer tells you to do it. Whenever the KEY is ON..ie Engine running, the clock is running...measured in Hours and Tenths of hours.
Go to the gas dock and FILL it up. Write down the reading from the Hour Meter in a little
logbook. Next time you need gas, go back to any gas dock and fill it up Again..AND write down the hour reading again. I always write down the Gallons pumped each time as well. Divide the gallons pumped to FILL up the gas tank... by the Hours and Tenths of hours on the hour meter. This will give you
Average GPH used since you last filled the tank....which will cover all types of driving during THAT fillup.
After a few Fill Ups you will see a trend which will reflect your overall average and you will be suprised that the GPH used will become pretty consistant from tank to tank. Don't worry about Who was on board at any given time because it will all average out.
I have a 40 gallon tank and when my gas guage gets down to half full I start thinking about another fillup. Gas guages are notoriously inacurate. The Hours used is much more acurate in determining how much gas is left in the tank, after you become used to the routine. You must AWAYS Fill Up for this procedure to work.