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Towing large boats

Old 03-02-2019, 10:25 PM
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I'm new to both boating and towing.. I recently bought this boat. Am I okay to tow it just a few miles one way to the ramp and maybe once or twice a year to the Keys from Houston?
Old 03-02-2019, 11:02 PM
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Originally Posted by Manoverboard123 View Post
I'm new to both boating and towing.. I recently bought this boat. Am I okay to tow it just a few miles one way to the ramp and maybe once or twice a year to the Keys from Houston?
No problem. Try to keep it under 80.
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Old 03-02-2019, 11:05 PM
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Originally Posted by Manoverboard123 View Post
I'm new to both boating and towing.. I recently bought this boat. Am I okay to tow it just a few miles one way to the ramp and maybe once or twice a year to the Keys from Houston?
You don't need that much truck for such a small vessel.

Dave
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Old 03-07-2019, 10:48 AM
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Not wanting to take this in a different direction....but a quick question.

I tow a 32 Seavee from Tampa down to Key West with a 2017 F250 6.7. I have a 19k rated triple axel trailer. Im at 22,800 lbs total CAT certified scale (truck at 6,700 + or - and boat/trailer 16,000 + or-) Absolutely no issues towing.

I am somewhat disappointed in the fuel mileage. She coming in at just under 8 mpg.

What are are you guys seeing?

Old 03-07-2019, 11:56 AM
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Originally Posted by BackCountryTampaBay View Post
Not wanting to take this in a different direction....but a quick question.

I tow a 32 Seavee from Tampa down to Key West with a 2017 F250 6.7. I have a 19k rated triple axel trailer. Im at 22,800 lbs total CAT certified scale (truck at 6,700 + or - and boat/trailer 16,000 + or-) Absolutely no issues towing.

I am somewhat disappointed in the fuel mileage. She coming in at just under 8 mpg.

What are are you guys seeing?

I am towing with my old 2nd gen Dodge 4x4 Cummins auto. Boat and trailer is about 14K. I got 10mpg most of the way home across the Dakotas bucking a headwind. Once I hit Montana, mileage increased to 11.5. Towing was at 60-62mph.

I run a 35" tire and 4.10 gears. The auto has a .70 overdrive.

I did field repair a pretty good boost leak in Montana. I had a split lower intercooler boot and used a bush fix as nothing was available in a remote location. I am sure that is where my fuel economy came from. I am running a large injector and a box. With everything off, I am at 400 RWHP. I also run a set of compounds and a small cam.

Wind resistance is definitely the biggest factor for me. I get 13 towing my 32' 5er at 65mph.

Dave
Old 03-07-2019, 12:44 PM
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My brother runs a Cummins and they, I believe, are much more fuel efficient. Im stock with no modification from factory. While Im good with straight highway without towing at 18 mpg, I thought Id be somewhere around 10ish when towing.

Good info, thanks.
Old 03-07-2019, 01:10 PM
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Originally Posted by BackCountryTampaBay View Post
My brother runs a Cummins and they, I believe, are much more fuel efficient. Im stock with no modification from factory. While Im good with straight highway without towing at 18 mpg, I thought Id be somewhere around 10ish when towing.

Good info, thanks.
I run at 24mpg empty on summer fuel and 23 on winter fuel.

Dave
Old 03-07-2019, 05:28 PM
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Originally Posted by fishin2deep4u View Post
I run at 24mpg empty on summer fuel and 23 on winter fuel.

Dave
Thats pretty good considering the 4.10s and 35s!
Old 03-07-2019, 06:22 PM
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2015 F250 CCSWB 6.7 3:55 gears 18 around town 21.7 highway 10 pulling 24K CC
2019 Chebby 3500 Duramax longbed dually 3:73 gears 13-14 around town 18 highway 9.9 pulling 24k CC
While the dually is better suited for pulling this load, the Ford would walk circles around the Chebby. Not sure why as the ratings are very close.
Old 03-07-2019, 07:00 PM
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Interesting...Im getting 14.5 around town and 18 highway on my 6.7. Guess the numbers are + or - where they should be towing 16k.

Still thinking the Cummins might have the Ford & Chevy beat with a heavy load.
Old 03-07-2019, 07:16 PM
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I would love to get the numbers folks get on here

2017 stock Cummins......
Unloaded highway is around 15.
Towing a 23 Maycraft Pilot House that doesn't weigh much more than 6k all in, I get 12.
Going slow through the hills and my property in 4x4, I get 8 or 9.

2010 highly, highly modified Cummins.....
Unloaded highway is 18.
Towing same is 16.
Slow on property I get 15.
Old 03-07-2019, 07:23 PM
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I drive a 2018 Ram 3500 almost every day at 8 mpg. I rent Fords and Chevys and still get about the same mileage. 16mpg towing? Maybe down hill.
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Old 03-07-2019, 07:46 PM
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Originally Posted by cajflynn View Post
I drive a 2018 Ram 3500 almost every day at 8 mpg. I rent Fords and Chevys and still get about the same mileage. 16mpg towing? Maybe down hill.
To be fair...straight highway with computer reset 400 + miles, 18 or slightly lower depending on speed. Around town, 14sh.

I was thinking 7+ towing was low. Guess Im where it should be. Wish I had a larger tank.

That 8 around town (empty) sounds low?
Old 03-07-2019, 07:49 PM
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Originally Posted by cajflynn View Post
I drive a 2018 Ram 3500 almost every day at 8 mpg. I rent Fords and Chevys and still get about the same mileage. 16mpg towing? Maybe down hill.
C'mon man.....its THT. Everyone on here gets good milage. Even in their boats, and it always seems to improve when they are selling it.
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Old 03-07-2019, 07:50 PM
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Originally Posted by BackCountryTampaBay View Post


To be fair...straight highway with computer reset 400 + miles, 18 or slightly lower depending on speed. Around town, 14sh.

I was thinking 7+ towing was low. Guess Im where it should be. Wish I had a larger tank.

That 8 around town (empty) sounds low?
The 8 every day is because he's towing, literally every day.
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Old 03-07-2019, 08:02 PM
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Got it on the 8.
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Old 03-08-2019, 11:51 AM
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Originally Posted by ERG153 View Post


Thats pretty good considering the 4.10s and 35s!
I gained over 2 mpg with the cam swap.

The fifth wheel and boat are virtually the same weight. But the boat has much more wind resistance. Years ago I towed a 3rd gen Dodge on an equipment trailer to Canada. I never broke 9mpg. Weight was probably close to the same as the other examples. Also, if I can't run at around 1800 rpm towing, my mileage takes a serious hit. That was the reason for the regear. With 3.54s I had to be going much faster than I wanted to tow at to be at the sweet spot for torque.

I used to pull a jet sled (around 3Klbs) every weekend hundreds of miles. I would get 17-18mpg at 70mph. That thing was an open tiller river boat and tucked real tight behind the truck. That setup had 3.54s and 33" tires.

My stock mileage was around 18mpg highway and 15 around town before making changes.

Dave
Old 03-08-2019, 12:22 PM
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My '15 2500 Duramax got about 9-10 mpg towing 7500# boat/motor/trailer

Originally Posted by Selser View Post
C'mon man.....its THT. Everyone on here gets good milage. Even in their boats, and it always seems to improve when they are selling it.
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Old 03-08-2019, 03:19 PM
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Originally Posted by Joe View Post
My '15 2500 Duramax got about 9-10 mpg towing 7500# boat/motor/trailer
Sounds spot on!
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Old 03-08-2019, 05:36 PM
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2002 Duramax, 14.5k lbs and 28', 10.5mpg (this was on a cross-country trip, 1800 miles.)

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