2008 GZ 250 for sale in Delaware * SOLD*

mrlmd1 · 12-01-2011, 01:38 PM

My 42' sailboat had an inboard Pathfinder diesel engine (basically a "marinized" 48hp VW) that was solid as a rock and burned only 3/4 gal/hr at 2000rpm pushing the boat at powered hull speed of 7 knots. When I bought the 40' sport fisherman, a totally different breed of boat, with it's twin 450hp turbocharged Detroit Diesels, and I asked the salesman about fuel consumption, I almost had a conniption. He said that at WOT I could burn 48 gal/hr and I told him I didn't use that much fuel in a year on the sailboat and I could go from NY to Nantucket and back twice on that amount in that other boat. It wasn't that bad though, most of the time at cruising speed at 20-25knots I maybe burned in the range of 15-20 gal/hr, so that comes out to about 1.25 mpg. Buts that's pushing a 28,000 lb. boat probably with another 500-1000lbs.+ of "stuff" on it. Shit, 400 gal. of diesel fuel by itself weighs 2400 lbs, then there's 120 gal of water which is another 700 lbs. if you have full tanks.
The Volvo 310hp Duoprop in my 27' boat (6000 lbs), which is basically a GM 454 engine, is pretty economical (?), burns about 12-14 gal at 25 knots, 3000rpms, and about 20-22 at 30 kts at 3500-3800 rpms. Trolling at 5-6 kts. it only burns 3. That's all in the range of 1.25-2 mpg.
My little 16' with the 75 hp 2 stroke Yamaha only burns a few gal/hr and gets about 8-10 mpg. Of course when you put the petal to the metal on any set of marine engines, getting to WOT, the fuel consumption goes up asymptotically in a drastic fashion. You can go as fast as you want if you just keep throwing money into the tank, a good reason to slow down. So it's all relative, but nothing for that much fun beats a motorcycle's economy, even the jetski.

12-01-2011, 01:38 PM	#26
mrlmd1 Senior Member Join Date: Jan 2008 Location: Crawfordville, Florida Posts: 2,853	Re: 2008 GZ 250 for sale in Delaware My 42' sailboat had an inboard Pathfinder diesel engine (basically a "marinized" 48hp VW) that was solid as a rock and burned only 3/4 gal/hr at 2000rpm pushing the boat at powered hull speed of 7 knots. When I bought the 40' sport fisherman, a totally different breed of boat, with it's twin 450hp turbocharged Detroit Diesels, and I asked the salesman about fuel consumption, I almost had a conniption. He said that at WOT I could burn 48 gal/hr and I told him I didn't use that much fuel in a year on the sailboat and I could go from NY to Nantucket and back twice on that amount in that other boat. It wasn't that bad though, most of the time at cruising speed at 20-25knots I maybe burned in the range of 15-20 gal/hr, so that comes out to about 1.25 mpg. Buts that's pushing a 28,000 lb. boat probably with another 500-1000lbs.+ of "stuff" on it. Shit, 400 gal. of diesel fuel by itself weighs 2400 lbs, then there's 120 gal of water which is another 700 lbs. if you have full tanks. The Volvo 310hp Duoprop in my 27' boat (6000 lbs), which is basically a GM 454 engine, is pretty economical (?), burns about 12-14 gal at 25 knots, 3000rpms, and about 20-22 at 30 kts at 3500-3800 rpms. Trolling at 5-6 kts. it only burns 3. That's all in the range of 1.25-2 mpg. My little 16' with the 75 hp 2 stroke Yamaha only burns a few gal/hr and gets about 8-10 mpg. Of course when you put the petal to the metal on any set of marine engines, getting to WOT, the fuel consumption goes up asymptotically in a drastic fashion. You can go as fast as you want if you just keep throwing money into the tank, a good reason to slow down. So it's all relative, but nothing for that much fun beats a motorcycle's economy, even the jetski.
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