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Bertram31.com General Bulletin Board
Numbers Correction...
Posted By: Capt Patrick McCrary In Response To: Gas to Diesel Justification: (Capt Patrick McCrary)
Date: Friday, 10 June 2005, at 7:25 p.m.
I kept thinking that my numbers sounded just too good, and Scott's post got me to do some more thinking & realized that I did my calculations on 100% cruise speeds. Duhhhhh...
Allowing for 60% trolling speeds, the numbers break out like this: (This adds just under another 3 years to the break even point if sold at that time and 5.6 years to the full break even if not sold.)
A gas powered boat yielding .9 MPG at 20 kts uses 22.2 gallons of fuel at a cost of $2.50 per gallon,
making the trip fuel expense $55.50. A 4 cylinder diesel getting 2.2 MPG at 22 kts takes 54 minutes
to make the same 20 nautical miles. The diesel is burning 9.1 gallons at a cost of $2.25 per gallon,
making the trip fuel expense $20.48.Gas @ 22.2 GPH x .4 x 200 hrs per year = 1,776 gallons x $2.50 per gallon = $4,440.00 (cruise speed)
Gas @ 7.0 GPH x .6 x 200 hrs per year = 840 gallons x $2.50 per gallon = $2,100.00 (trolling speed)
Total annual cost: $6,540.00Diesel @ 9.5 GPH x .4 x 200 hrs per year = 760 gallons x $2.25 per gallon = $1,710.00 (cruise speed)
Diesel @ 3.5 GPH x .6 x 200 hrs per year = 420 gallons x $2.25 per gallon = $945.00 (trolling speed)
Total annual cost: $2,655.00Difference is $3,885.00. If the re-power was new engines and pro install, costing $50,000.00, the break
even point in just fuel cost alone would take 12.9 years. If 40% of your running time is spent getting
to and from the fishing grounds, and you're making 10% better speed with diesel, that's 140 hours
fishing as opposed to 120 hours with gas. If the average fishing day, (actually with lines out), is 5 hours,
that's the equivelent of another 4 days fishing per year.If a gas powered boat has a value of $50,000.00 with gas engines, and the same boat has a value of
$75,000.00 with diesel engines, easily $25,000.00 of the conversion is recovered upon selling. So,
if our hypothetical repower was $50,000.00 & $25,000.00 is recovered, how long would you have to
own the boat to break even? $25,000.00/$3,885.00 = 6.4 years...
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