Good information! The more I learn about operating smaller twin diesels, the more I tend to investigation of the possibility. I had shyed away initially because I had been told that fuel burn of 6-8gph were the norm on them. However, I am getting a lot different picture from owners here on the list. Gotta love this TWL for helping one cut through the clutter? I can live with 3-4gph and should have known better. After all I forgot that I used to push my 48 LRC at 8 kts on about 6gph via the twin 100hp Detroits. Actually the 6-8 gph figure came from a boat with twin 225's. I used to get about 10 kts out of my twin Cat 375's, but could never get the gph below about 10. Jim ----- Original Message ----- From: peter denton To: jim_alexander@frontier.com Sent: Monday, April 11, 2011 10:45 PM Subject: Fwd: T&T: self insuring Jim We have a 42 footer in FL. 300K loss cost 4k. We have dropped everything except liability @$700. On another issue 2 engines use only marginally more fuel than one because the controlling factor is delivered HP. We have twin Deutz and at 1800 use 2.3-2.5 g/h and Susie Q is fat. Peter Denton Susie Q

Jim: I'm running twin Cat 375TA's and pushing a 46', 45000# boat, at about 8 knots. (all +/-) 1200 RPM has been my comfortable cruise as a displacement hull. My fuel usage over the past 5000 miles suggests that I'm getting about 2.2 miles per gallon, or just about 4 gallons per hour. (I subtract .9 gallons per hour for my 8kw WB generator usage) My WOT is 2400 rpm and I run it up there periodically about every 10 hours to burn out the carbon. It's fun to bump her up to 20 miles per hour on the water but I'm hesitant to check the fuel burn at that cruise speed! Jim -------------------------------------------------- From: "Jim Alexander" <jim_alexander@frontier.com> Sent: Monday, April 11, 2011 11:44 PM To: "TWL" <trawlers-and-trawlering@lists.samurai.com>; "peter denton" <luxembergphd@gmail.com> Subject: Re: T&T: self insuring > Good information! The more I learn about operating smaller twin diesels, > the > more I tend to investigation of the possibility. I had shyed away > initially > because I had been told that fuel burn of 6-8gph were the norm on them. > However, I am getting a lot different picture from owners here on the > list. > Gotta love this TWL for helping one cut through the clutter? I can live > with > 3-4gph and should have known better. After all I forgot that I used to > push > my 48 LRC at 8 kts on about 6gph via the twin 100hp Detroits. Actually > the > 6-8 gph figure came from a boat with twin 225's. I used to get about 10 > kts > out of my twin Cat 375's, but could never get the gph below about 10. > > Jim > ----- Original Message ----- > From: peter denton > To: jim_alexander@frontier.com > Sent: Monday, April 11, 2011 10:45 PM > Subject: Fwd: T&T: self insuring > > > Jim > We have a 42 footer in FL. 300K loss cost 4k. We have dropped everything > except liability @$700. On another issue 2 engines use only marginally > more > fuel than one because the controlling factor is delivered HP. We have > twin > Deutz and at 1800 use 2.3-2.5 g/h and Susie Q is fat. > Peter Denton > Susie Q

I recalculated using .6 GPH for the genset and came up with 4.25 GPH for the twin CAT's ....mileage is probably less accurate as I estimate the daily mileage for my log. but using the GPH burn rate at 8 knots / 9 mph it's still a respectable 2.1 mpg, also, maybe adjusting for idle speed and using 8 mph, it would be 1.9 mpg. so....Two miles per gallon is a nice round figure! -------------------------------------------------- From: "Quinces" <vquince@comcast.net> Sent: Tuesday, April 12, 2011 7:46 AM To: "Jim Alexander" <jim_alexander@frontier.com> Cc: <trawlers-and-trawlering@lists.samurai.com> Subject: T&T: Twins fuel burn > Jim: > > I'm running twin Cat 375TA's and pushing a 46', 45000# boat, at about 8 > knots. (all +/-) 1200 RPM has been my comfortable cruise as a > displacement hull. > My fuel usage over the past 5000 miles suggests that I'm getting about 2.2 > miles per gallon, or just about 4 gallons per hour. > (I subtract .9 gallons per hour for my 8kw WB generator usage) > My WOT is 2400 rpm and I run it up there periodically about every 10 hours > to burn out the carbon. > It's fun to bump her up to 20 miles per hour on the water but I'm hesitant > to check the fuel burn at that cruise speed! > > Jim > > -------------------------------------------------- > From: "Jim Alexander" <jim_alexander@frontier.com> > Sent: Monday, April 11, 2011 11:44 PM > To: "TWL" <trawlers-and-trawlering@lists.samurai.com>; "peter denton" > <luxembergphd@gmail.com> > Subject: Re: T&T: self insuring > >> Good information! The more I learn about operating smaller twin diesels, >> the >> more I tend to investigation of the possibility. I had shyed away >> initially >> because I had been told that fuel burn of 6-8gph were the norm on them. >> However, I am getting a lot different picture from owners here on the >> list. >> Gotta love this TWL for helping one cut through the clutter? I can live >> with >> 3-4gph and should have known better. After all I forgot that I used to >> push >> my 48 LRC at 8 kts on about 6gph via the twin 100hp Detroits. Actually >> the >> 6-8 gph figure came from a boat with twin 225's. I used to get about 10 >> kts >> out of my twin Cat 375's, but could never get the gph below about 10.