Originally Posted by fund razor

Here's what you do. Divide the number of gallons in the tank by 6. (6 pounds is the approximate weight of a gallon of gas.)
Multiply that number by .75 (the difference between full and a quarter tank). Now divide that number by 180 (average weight of your friends).
Then simply invite the resulting number of 180 pound friends on a boat ride. Start out with just over a quarter tank of gas and the proper number of ballast buddies.

Once you are up on plane, simply toss your friends off of the boat one at a time and record your GPS speed after each friend hits the water.
Then you will know what your speed difference is at different weights, all the way down to 1/4 tank.

It works great. For me the difference is about 2 mph.
Which is lucky for my friends, or I wouldn't have gone back for them.

Good luck.

Originally Posted by fund razor

oh yeah... it only works once. :D

Originally Posted by t500hps

Then you didn't have enough friends to start with.

Originally Posted by dtsquest

Can't wait to test Fund Razor's theory. Only thing is I will have to do it after dark cause I don't want anybody seeing 180 lb "female friends" in my boat. :drink: results will be posted as soon as the ice is off the lake :(

Originally Posted by t500hps

A 454 MPI is either a 310hp or 330hp depending on the year (I believe an MPI is 310hp). If that's the case, then 4,600 RPM's would be WOT and a procharger will kill that motor in short order.