E4OD auto mileage vs. ZF-5?????????????? - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 11-06-2006, 08:35 AM   #1 (permalink)
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E4OD auto mileage vs. ZF-5??????????????

Hey guys im lookin at a crew cab obs psd but its an auto. Just wondering what you all average for mpg with the e4od? I average about 19 with my truck with the zf-5. Thanks.
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Old 11-06-2006, 08:48 AM   #2 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

Automatics, from people I've talked to with them, seem to get a little better mileage. Mainly, I'm sure, since they tend to gear an auto to run lower rpm's once locked into overdrive. A friend of mine has a very similiar truck but with his, an auto, at 70 mph he is turning about 500 +/- rpm's slower. And he get a couple miles per gal. better than me. But then, I am not as concerned about having to pay a tranny repair bill as he is [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 11-06-2006, 11:16 AM   #3 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

Auto's cost more to keep going for the long haul, almost gauranteed, but, they are faster and more trouble free when driving them, and with proper care and cooling can last a long time.... but not as long as a manual that is not abused, just MHO, and everybody has one.

In this case, yes, the AT has more overdrive than the ZF, so, a truck with the same tires and gears at the same speed will turn less rpms auto vs stick.

However, every time the AT converter is unlocked - the AT is using more fuel than an MT. Also the MT has more gears, but not the torque multiplication of an AT converter.....

it's a toss up from a usage stand point, it's really a personal preference.
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Old 11-06-2006, 11:55 AM   #4 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]
In this case, yes, the AT has more overdrive than the ZF,

[/ QUOTE ]
The ratios are 0.72:1 for the manual and 0.71:1 for the automatic. That's a difference of 1.4%.

If you are at a speed where the automatic truck is turning 2000 RPM the manual truck will be turning 2,028 RPM. I don't think that is enough to see on the stock tach, much less make ANY difference in fuel economy. And that's assuming the auto's torque converter is locked. If not, the auto will be turning a lot more RPM than the manual.
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Old 11-06-2006, 09:40 PM   #5 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

From the specs I looked at before buying my truck the "standard" gear ratio for a F350 PowerStroke with a manual tranny was 4:11 - 1, and the same truck with an auto was 3:73 - 1. A considerable differance. Of course you could order a different ratio but ...
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Old 11-07-2006, 04:16 PM   #6 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????


If you want MPGs, look for a 3.55 rear gear. That's gonna make the biggest difference IMO between an auto and manual. If you want towing power go with the 4.10 but expect a noticable milage drop.

Our CC gets 20mpg on the highway with the auto and 3.55 gears.
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Old 11-07-2006, 08:59 PM   #7 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

In town only driving in think the manual trans is superior. All the time waiting for the converter to lock when accelerating just feels like a huge waste of fuel to me. It's direct and quick with the manual trans, and would just have to be more efficient.
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Old 11-07-2006, 09:14 PM   #8 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]
at 70 mph he is turning about 500 +/- rpm's slower.

[/ QUOTE ]


thats a huge difference. id say you are comparing a 4.10 in your truck to a 3.55 gear in his [img]/ubbthreads/images/graemlins/shrug.gif[/img] also, im pretty sure 3.73's were only offered from the factory in the 99+ trucks.
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Old 11-08-2006, 07:53 AM   #9 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

3.55 is the only way to go for mileage, also stick with conservative tires and keep the tire size close to original.
as for the OD ratio's I don't recall the numbers exactly, but at some point here someone had posted them, I thought the e40d was .71 and the zf .75... not a huge difference either way.

There is one fella here who put 3.08 gears in the back of his 2wd.... loves it for the mileage, and can still outpull a gasser!
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Old 11-08-2006, 09:47 AM   #10 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]
The ratios are 0.72:1 for the manual and 0.71:1 for the automatic.

[/ QUOTE ]
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Old 11-08-2006, 09:42 PM   #11 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????



[ QUOTE ]
thats a huge difference. id say you are comparing a 4.10 in your truck to a 3.55 gear in his [img]/ubbthreads/images/graemlins/shrug.gif[/img] also, im pretty sure 3.73's were only offered from the factory in the 99+ trucks.

[/ QUOTE ]

Not positive, but I do know my previous truck, a '79 F250 camper special, with a 460 & auto, came with a 3:73 rear end.

milner351, man you'd have to have an auto with 3:08's. But, once it was rolling you should be able to do 75 mph around 1400 rpm's. Thats probably too low unless your always running empty. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 11-08-2006, 10:13 PM   #12 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

On my 97 I am only getting 16 mpg at the very best with stock tires, I have an auto with 3.55's. I wish I could say I was getting 20 mpg
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Old 11-08-2006, 10:58 PM   #13 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]


[ QUOTE ]
thats a huge difference. id say you are comparing a 4.10 in your truck to a 3.55 gear in his [img]/ubbthreads/images/graemlins/shrug.gif[/img] also, im pretty sure 3.73's were only offered from the factory in the 99+ trucks.

[/ QUOTE ]

Not positive, but I do know my previous truck, a '79 F250 camper special, with a 460 & auto, came with a 3:73 rear end.

milner351, man you'd have to have an auto with 3:08's. But, once it was rolling you should be able to do 75 mph around 1400 rpm's. Thats probably too low unless your always running empty. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

[/ QUOTE ]

In our year f250 and 350's had only two options factory, 3.55 or 4.10. Lower in the heavier trucks.
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Old 11-08-2006, 11:01 PM   #14 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]
Not positive, but I do know my previous truck, a '79 F250 camper

[/ QUOTE ]



im talking about powerstrokes...
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Old 11-08-2006, 11:04 PM   #15 (permalink)
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Re: E4OD auto mileage vs. ZF-5??????????????

[ QUOTE ]
In our year f250 and 350's had only two options factory, 3.55 or 4.10. Lower in the heavier trucks.

[/ QUOTE ]


thank you [img]/ubbthreads/images/graemlins/wink.gif[/img]
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