fuel mileage comparison

[Dirty-D]

Im thinking about selling my pair of yamaha 2001 model 250 0x66 and repowering with 4 strokes. Im getting around .8mpg and need 1.2 or better to reach the tuna grounds off freeport Tx. Need some advice from anyone with a marlin who has repowered from 2 cycle to 4 cycle.

 

[Finatic]

I can't give you any direct comparison for the Marlin but I just went through the same upgrade on a 2000 232 Gulfstream. I went from twin 150 OX66s to twin 150 four strokes. At cruise on the way out to the fishing grounds, I was averaging 1.2-1.4 mpg with the OX66s now I am between 1.8-2.0 mpg with the 4 strokes. I really see a big difference when trolling, the fuel economy has more than doubled. Last year with the OX66s, I would typically burn 115-120 gallons of gas for a day of fishing, now the most fuel I've used on any trip was 85 gallons. Good luck with your decision.

 

[Capt. Ed]

With F225's, my 2004 Marlin got 1.2-1.3 mpg on offshore trips. I used all miles from my gps including trolling time for the day. Hope this helps.

 

[Slacktime]

I have similar performance to capt. ed with F225s on a '03 Marlin. In good weather and tweaking the trim for the sweet spot, I can get 1.4 -1.5 NMPG. I have seen from other posts that the 225s are have a little lower consumption but may be a bit slower on the top end compared to the 250s. Overall, I am happy with the performance and not too many guys run at WOT unless they have very deep pockets.

 

[Lainie J]

I have a 1997 with 2002 F225's and Slacktime is just about right, 1.4 -1.5 on average.

 

[Heavy Duty]

I'm thinking of doing the same thing with my '99 sailfish. Couple of questions though:

1. Did you guys have to drill new mounting holes or will the 4-strokes use the same holes as the OX-66s.

2. Did you use the same controls or did you have to get new controls.

3. How about the used route. Found a matched pair of '03 F225s in Fla but they have about 1500 hours on them.

Just rying to get an idea of cost and what is involved before I jump in.

Even if it saves a couple of gallions now-a-days any savings is a plus.

Thanks

 

[Capt and the kids]

257 Advance with twin F150

13 miles gallong per hour
2 miles per gallon

 

[cgmiller]

I have a 1990 23 Gulfstream with a pair of 2004 F150's (1000 hrs). The boat humps along. At 3500 rpms I am running 25 mph burning about 11 gallons per hour combined as per the flow scan. At 4000 rpms she runs at 30 mph burning 14 gallons per hour combined for a little better than 2 miles per gallon.

 

[magicalbill]

Since everyone is chiming in with stats for other boats than the Marlin in question, I'll give my Gulfstream numbers..

1.9 to 2.1 MPG running between 3700-4000 RPM, running 29 MPH at 3700 and 33 MPH at 4000-4100 RPM.

Power is twin 200 Yamaha 4-strokes.

I think it's reasonable to assume you'll get better mileage with 4-strokes; Maybe even significantly better.

 

[Dirty-D]

Thanks for the stats. Theres a marlin in my marina that has new 300 yamahas on it but never seem to be there when the owner is there. Id really like to hear what he has to say about those 300s. Thanks again

 

[fishinmission]

go on the grady site or even yamaha site they have like boats and you can get a good idea of where you will be at !!!

 

[Tucker]

If this is a financial decision to save money on fuel I believe you will never recover the cost of a 4-stroke repower. You need to start from scratch, new controls, gauges, etc. If you want more range and like some new iron hanging on the back...well that's a different story. Those 300's are sweet, wonder if Grady will give you a letter? Love the Marlin's but they are lead-sleds.

 

[rsgandy]

i'm sure you have made your decision by now, however for reference , my 96 marlin with 250's (2 stroke) would run about 30 GAL. per hr. @ 28 to 29 sm. per hr.
My new 250 4strokes burn about 22 to 24 gal at the same speed.
the big difference is the mid range torque. I can now run slower and still stay on plane. So if I want to run @ 25 smph. I can get up to 1.5 mpg.
much stronger motors.