Greetings, what with the price of fuel going ballistic, Iím thinking about re-powering but having trouble with the numbers.
I have a 30' aluminum ocean boat that weighs about 8,000 - 8,500 lbs fully loaded with fuel, water, gear, food, kids, and dogs - my biggest fuel saving initiative is to pack up the troops and head out for at least 3 days or more if I can swing the time off work, so we head out fairly loaded. The boat has a '91 300 hp Evinrude looper. I'm getting around 1.2 - 1.4 statute miles per gallon at optimum cruise.
I've looked over the various test reports for both 2-stroke and 4-stroke outboards and am trying to get a feel for what improvement in fuel economy I'd get by re-powering. Of course, all of the test reports are on much smaller boats with hardly any load so the numbers look great. The E-Tec folks will firmly stand by a 20% increase in economy.
I'd like to hear real-world data on folks that have re-powered from old 2-stroke technology to either new 2-stroke technology or 4-stroke with a same horse power conversion. What increase in mileage did you realize?
I keep coming to the same conclusion - I can buy a hell of a lot of fuel for $20k and keep running the looper until it dies. The pay off period just in fuel savings (at $5/gal) assuming a 30% increase is about 10 years, assuming that I maintain the same range that I do now...and realistically, with better economy I'd likely end up burning up the same mount of fuel in a weekend that I do now as I'd probably go further out - the SO pointed this out the other day and basically called BS on my re-powering argument.
Thoughts and data are appreciated.