Fuel Consumption: Merc 469HO vs. Merc 525

[Not So Fast]

Mike,
If you have a line on a couple of 525's and you change your mind, please let me know. I would love to upgrade to 525.
Based of the guys I run up and down the River with, who have 525's, the difference in fuel usage seems to be small.
No NO nO you dont John, that wouldnt be fair NSF

[Magic34]

Michael-
Leave your damn barge alone!!
you get your bimini top fixed yet?
Fixed. Absolute took care of it.

[Magic34]

Right now I cruise at 3600 RPM and run about 36 MPH.
I would like to run 3600 RPM and cruise above 40. Would also have a top speed around 60. Crazy speed, I know.

[ULTRA26 # 1]

No NO nO you dont John, that wouldnt be fair NSF

[ULTRA26 # 1]

Right now I cruise at 3600 RPM and run about 36 MPH.
I would like to run 3600 RPM and cruise above 40. Would also have a top speed around 60. Crazy speed, I know.
Are you running Bravo 3's. What is your max RPM?

[Magic34]

Are you running Bravo 3's. What is your max RPM?
Yes, 5000 RPMs.
I am running dual props 28s on it. Everyone else with a boat like mine is running 26 duals.

[SB]

1 gallon = 12 hp for an hour

[Magic34]

1 gallon = 12 hp for an hour
At what RPM? Based on that formula, the 525 will consume 6.25 more gallons per hour, but at what RPM or is that across the board? WOT, just 6.25 more than the comparing motor? 3500 RPM, just 6.25 more than the other motor?
So after running 5 hours at whatever RPM, I will have used 62.5 more gallons over the 496HO?

[Troubles No More]

try this site, lots of info
http://www.boattest.com
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Cobalt 343
Test Power: 2 x 425-hp MerCruiser 496 MAG HO
RPM MPH Knots Total GPH MPG NMPG Range NM Range dBa
650 4.7 4.0 3.1 1.50 1.30 270 235 66
1000 6.6 5.7 5.2 1.27 1.10 228 199 69
1500 9.2 8.0 9.0 1.02 0.89 184 160 72
2000 11.2 9.7 13.8 0.81 0.70 145 126 77
2500 16.1 14.0 20.8 0.77 0.67 139 121 78
3000 30.1 26.2 23.1 1.30 1.13 235 204 81
3500 40.9 35.6 31.5 1.30 1.13 234 203 85
4000 46.3 40.2 37.8 1.22 1.06 220 192 86
4500 53.9 46.9 47.9 1.13 0.98 203 176 87
5000 56.9 49.5 68.4 0.83 0.72 150 130 92
5100 62.4 54.2 69.2 0.90 0.78 162 141 92
Cobalt 343 Length Overall 35'4''
Dry Weight 10,200 lbs
Beam 9'8''
Fuel Cap 200 gal.
Draft 37'' drives down
Water Cap 10 gal.
Deadrise/Transom 24.5 deg. Bridge Clearance 69''
.................................................. .........................
Baja 26 Outlaw (2007-)
Test Power: 1 x 425-hp MerCruiser 496 Mag HO (sterndrive)
RPM MPH Knots Total GPH MPG NMPG Range NM Range dBa
600 3.9 3.3 1.7 2.26 1.97 206 179 74
1000 6.3 5.4 2.8 2.23 1.94 203 176 73
1500 8.1 7.0 4.5 1.81 1.57 164 143 83
2000 10.3 8.9 6.7 1.54 1.34 140 122 83
2500 26.6 23.1 7.9 3.37 2.93 306 266 83
3000 32.2 28.0 10.1 3.20 2.79 291 253 84
3500 41.7 36.3 14.4 2.90 2.52 263 229 89
4000 49.7 43.2 19.5 2.55 2.21 231 201 92
4500 56.0 48.7 27.4 2.05 1.78 186 162 92
5000 60.8 52.8 33.7 1.81 1.57 164 143 94
5120 66.2 57.6 34.8 1.90 1.65 173 150 95
Length Overall 26' 0''
Dry Weight 4,800 lbs.
Beam 8' 4''
Fuel Cap 101 gal.
Draft 38''
Deadrise/Transom 24 deg.
.................................................. ............................
Baja 40 Outlaw
Test Power: 3 x 500-hp MerCruiser 525 EFI
RPM MPH Knots Total GPH MPG NMPG Range NM Range dBa
650 5.8 5.0 6.2 0.93 0.81 249 217 78
1000 6.9 6.0 8.1 0.85 .74 227 197 83
1500 13.3 11.5 15.9 0.83 .72 222 193 82
2000 23.8 20.7 24.6 0.97 0.84 257 224 84
2500 35.0 30.4 35.0 1.00 0.87 267 232 87
3000 43.0 37.4 39.3 1.09 .95 291 253 86
3500 50.0 43.5 62.9 0.80 0.69 212 184 89
4000 59.8 52 81.3 .73 .64 196 170 91
4500 69.7 60.6 102.9 .68 .59 180 157 92
5000 76.6 66.6 120.3 .64 .55 170 148 94
Baja 40 Outlaw Length Overall 40 '6''
Dry Weight 12,000 lbs.
Beam 8' 6''
Fuel Cap 296 gal.
Draft 3' 4''
Water Cap 15 gal.
Deadrise/Transom 24 deg.

[Cole Trickle]

At what RPM? Based on that formula, the 525 will consume 6.25 more gallons per hour, but at what RPM or is that across the board? WOT, just 6.25 more than the comparing motor? 3500 RPM, just 6.25 more than the other motor?
So after running 5 hours at whatever RPM, I will have used 62.5 more gallons over the 496HO?
yes......
Now stop messing with the yaht
It's never going to be fast......your gonna build a huge headache/money pitt:idea: :jawdrop: