Is the d-max more efficient or is the chevy truck more efficient? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 33 (permalink) Old 06-30-2009, 01:12 PM Thread Starter
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Is the d-max more efficient or is the chevy truck more efficient?

My truck in the sig gets 19-19.5 at 2k rpm or 70 mph ish. I have a friend who claims his 02 d-max gets 22 mpg on the highway. Both are cc sb and fwd. He runs some sort of edge product. My current numbers were with my old DP chip. My truck sits higher. He has a tonneau cover and I have a cab with a slight bump. My numbers are with the stock 265s and he had 245s. I wonder if it is just that his truck looks way less stout.

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post #2 of 33 (permalink) Old 06-30-2009, 01:41 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

One thing - your topper is hurting your mileage while his tonneau is helping his.
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post #3 of 33 (permalink) Old 06-30-2009, 02:57 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

D-max is more efficient engine design and is smaller displacement, truck is lower and lighter, and he may have a final drive ratio advantage but I have not looked it up, but I doubt his effective gear ratio is the same as yours.

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post #4 of 33 (permalink) Old 06-30-2009, 04:21 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

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Originally Posted by clydesdale View Post
My truck in the sig gets 19-19.5 at 2k rpm or 70 mph ish. I have a friend who claims his 02 d-max gets 22 mpg on the highway. Both are cc sb and fwd. He runs some sort of edge product. My current numbers were with my old DP chip. My truck sits higher. He has a tonneau cover and I have a cab with a slight bump. My numbers are with the stock 265s and he had 245s. I wonder if it is just that his truck looks way less stout.
The most I have ever got is 17-18 mpg highway on my 02 Dmax CC SB. I also have had an edge box in it and only noticed maybe 1mpg better if that! Now if yours buddys truck was an 06 or newer 22mpg would probally be belivable.

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post #5 of 33 (permalink) Old 06-30-2009, 06:47 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

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Now if yours buddys truck was an 06 or newer 22mpg would probally be belivable.
The opposite is true.

The 01-04.5 Federal emissions trucks with the LB7 are by far the most efficient duramax trucks. Less power, no EGR, wastegated turbocharger, and lower fuel rates (less aggressive fueling) help here.

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truck is lower and lighter
That is another advantage the El Camino has over the Ford.

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Originally Posted by tch. 280
and he may have a final drive ratio advantage but I have not looked it up, but I doubt his effective gear ratio is the same as yours.
If he has an Allison, the gear splits are far more mileage-friendly than the 4R100 but you have a 6 speed so the OD ratio is the same, but you're making a lot more on-off transitions with the foot-feed. The overdrive ratio is the same and my bet is that both trucks have 3.73 gearing.

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post #6 of 33 (permalink) Old 07-01-2009, 02:46 AM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

[QUOTE=cleatus12r;553346]The opposite is true.

The 01-04.5 Federal emissions trucks with the LB7 are by far the most efficient duramax trucks. Less power, no EGR, wastegated turbocharger, and lower fuel rates (less aggressive fueling) help here.



Id have to disagree on that one with you. One of my trucks is a dmax and we get about 19-20 out of it with no problem . Its all highway miles but might as well be city. lots of stop a go full throttle take offs mergin into traffic on the highway. with that 6speed auto crusin 70 and 1700rpms helps a lot. Oh and that truck has 270,000 on it with no problems yet! just regular maintance. So I would say 22 is deffinatley possible with regular driving.

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post #7 of 33 (permalink) Old 07-01-2009, 04:24 AM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

Are you sure he is hand calculating or is he using the lie-o-meter in the dash? My father in laws 04 Dmax shows he is getting 28.

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post #8 of 33 (permalink) Old 07-01-2009, 05:04 AM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

Don't the newer d-maxes have lower static compression? That would affect fuel economy if so.
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post #9 of 33 (permalink) Old 07-01-2009, 01:38 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

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Don't the newer d-maxes have lower static compression? That would affect fuel economy if so.

Yes they do. The older engines had 17.5:1 while the new ones are at 16.5:1. It's hard to believe that they start as good as they do at -20 degrees.

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post #10 of 33 (permalink) Old 07-01-2009, 01:57 PM
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Re: Is the d-max more efficient or is the chevy truck more efficient?

Shouldn't CR injection have already come up in this thread? Maybe followed up by 4v heads?
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