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O/T fuel milage (towing)

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Nebraska Cowman

07-28-2005 17:36:07

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Just figured up my little trip to RPRU 8.89 with the dodge hemi pulling a 6000+ tracor over hill and dale. So I am thinking....A friend has offered to give me a 1954 Ford and I would like to build a custon diesel towing machine. but I don't know..can I realy expect to come up with a combination that will beat 10 miles? Anybody done this? and suggestions? power? drive train? axels and wheels?

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NDS

07-29-2005 07:27:52

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

I think driver has major bearing on fuel mileage. I have 1994 2500 454 Chev. than gets 7 MPG tops pulling 8k trailer and I rarely run over 65 MPH. Travel with my brother in law some and he always gets lot better fuel mileage but we have to pull over and wait on him every 50 miles or so. He runs same speed as I do on flat ground but takes forever to get up to speed and on hill he refuses to "mash on gas".

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TP from Central PA

07-29-2005 06:56:37

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

I don't think I'll buy another truck and leave it stock..... ..... I am getting almost as good as my Cousin is with his Honda Shadow with my '71 C-20 Cummins Conversion. Of-course they is just running light and not towing..... ..If I build another one I am going to use a 2-speed rear so I got a set of gear ratios to tow, and a set for good fuel mileage running light.

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T_Bone

07-28-2005 22:27:46

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

Hi NC,

I have a 02 F350, DRW, CC, lwb, 6spd, 3:73, 4wd and pull a RV, about 16kGCW, and get 14.1mpg pulling the Colorado Rockies and 16.5mpg pulling the AZ mountains. My 15k mile lifetime average 17.1mpg that includes 6k miles of pulling 16kGCW. All hand calculated, not the overhead puter. That's pulling 60mph on the flats and 42mph on the 7% & 8% grades.

From what I've seen of the new DBW (drive by wire) fuel systems, it's all in how you drive them. A tad to hard upon acceleration drops mileage considerable.

I pull by maximum torque rpm or 1600rpm at all times. I shift at 1250rpm on level ground and add fuel slowly to reach speed. That's to keep from lugging the engine.

I just got back from buying a couple tractors and that ran me upto 31kGCW for the 2k mile trip home. I didn't like the fuel mileage as it dropped me too 8mpg while using turbo power at 2250rpm. Although I could pull the load at 1600rpm and 10.4mpg, it was just so darn slow so it was worth the 2mpg loss just to get home sooner.

T_Bone

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McDiesel

07-28-2005 22:12:11

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

My 1985 chevy 3/4 ton 4x4, with a 400 transmision, 350 4 barrel, 4:10 gears, 6 miles to the gallon pulling a 6000 pound tractor. and 8 miles empty. My 1998 3/4 ton 4x4 6.5 turbo diesel with automatic and over drive with 4:10 gears, get 12 loaded with the same load, and 16 empty. Millage will drop considerably if you run over 70, empty or loaded.

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Wardner

07-28-2005 20:30:32

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

I did what you are contemplating back in the '60s. I took a '47 KB-5 International and replaced the flathead six with a 4-53 120 hp Detroit. It is a head turner and a fun, yet noisy, truck. It would have made quite an impression at the RPRU with a M loaded on it.

I had to change the rear end, tranny, steering box, driveshaft, and reform the firewall. It never weighed less 12,000 lbs and spent half its road miles at around 20,000 lbs. I used it until 1980 when I bought a new tandem axel S1954 Navistar. Still own both trucks.

The KB-5 gained 42 hp and was a big improvement over the stock 78 hp. I suspect fuel milage increased substantially but that was never a concern as I was buying bulk diesel for less than 20 cents a gallon. The biggest advantage of having the diesel conversion was storing my own fuel and completely avoiding the '70s fuel crisises.

Now that I am older, I would never go to the trouble of building another truck. There is a huge inventory and impressive selection of used trucks on the market. Your time is better spent making money than spending it on something that may not be any better than something you could find in the classifieds. And I say that even while I have half a dozen DDs around here. Anybody need a new 4-71T or a rebuilt 12v-71?

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DAn67

07-28-2005 20:25:43

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

95 powerstroke 4x4 3/4 4:10 5 speed get near 25 empty last trip I checked with slant load horse trailer two horses 5hour trip and got 18 good truck

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Jon in IL

07-28-2005 19:41:55

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

cowman I drive a 1997 ford f350 for work. The truck weighs 13500 and it get 13mpg. It has the powerstroke. I was realy impressed with that.

Jon in IL

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MeAnthony

07-28-2005 19:07:07

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

Why not find an older, but good, 6.9 or 7.3 with a 5 speed? Should be a economical yet strong runner. A top-shelf mechanic I know over in Monroe put a Cummins in a '70's Dodge 4 door 3/4 ton short bed. He likes the older style of the truck and loves the diesel. So why not?

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Bill in NC

07-28-2005 18:57:22

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

What kind of rear end ratio does your truck have? I had a 1993 Buick Roadmaster Wagon that got 22 - 24 mpg at 65 mph, but dropped down to 9 mpg when towing a 3500 pound boat. It had a 2.73:1 rear end. My Yukon has something like a 3.9:1 rear end and gets 16 mpg on the road not pulling and 14 mpg pulling the boat. The Buick would fly when not towing, but flat let me know it didn't like pulling the boat. When the Yukon pulls the boat, it acts like nothing is behind it. Both vehicles had/
have 350 engines. Trailer Boating Magazine tests lots of trucks pulling heavy boats and their tests show rear end ratios matching to engine power/torque curves is a big deal. The other idea from Trailer Boating Magazine is reprogramming the engine control chip for better towing performance and then later resetting the chip for best non-towing performance. Apparently, some truck engines get significantly better towing performance by just reprogramming the chip.

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old

07-28-2005 18:12:46

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 17:36:07

Thats not very good. My 1980 chev 4X4 gets around 18-20 loaded or unloaded it has a 350 with 4 barrel.

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Nebraska Cowman

07-28-2005 18:20:29

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Re: O/T fuel milage (towing) in reply to old, 07-28-2005 18:12:46

Old, Where do you buy your gas?

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harnessbc

07-28-2005 18:57:00

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 18:20:29

..... yep, that is pretty good mileage..... ..i just got rid of my '96 chevy 3/4ton 5.7L vortec, 4x4, auto. because i only got 10 mpg..... .when my need for hauling and towing power went away, so did that gas hog..... ..best wishes, bill

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old

07-28-2005 18:44:30

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Re: O/T fuel milage (towing) in reply to Nebraska Cowman, 07-28-2005 18:20:29

Local place in town, ya when I got the truck I figured it would be a gas hog but its really good on gas. Has a 4 speed and I can get it up to 60 mph in sec but don't do that often. Does lack when pulling up hills on the high gera side but does a good job

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Jon in IL

07-28-2005 19:50:37

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Re: O/T fuel milage (towing) in reply to old, 07-28-2005 18:44:30

Old I had a 1984 gmc suburban it had a 454 and it got 12mpg if I pulling it or if it was just cursing around. It was awasome.

Jon

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