Ram Cummins Vs GM Duramax Ike Gauntlet

They ran the GMC in tow/haul, and didn't in the Ram.

Why would anyone leave the exhaust brake on long enough to slow the combo way below the speed they want to travel at ob down grades. Maybe I missed somethin'.
Anyways good for GM and a EB that works like it should.

I think every Cummins owner here needs to write these guys an email telling that they need to use the exhaust brake in auto mode(green icon) if they are going to let the truck do all the work and in regular mode(yellow icon) if they are going to manually shift.

eHoefler wrote:
They ran the GMC in tow/haul, and didn't in the Ram.

This is true going uphill, BUT downhill they DID.

Using the Lie O Meter is a joke.

How about choosing a gear like 3rd or 4th and set the cruise to the speed you want to hold. Works GREAT!

I have tried the AUTO mode, the above works MUCH better! Maybe it has to do with me towing 6% or steeper grades with a combined 33-35K.

Cummins12V98 wrote:
How about choosing a gear like 3rd or 4th and set the cruise to the speed you want to hold. Works GREAT!

I have tried the AUTO mode, the above works MUCH better! Maybe it has to do with me towing 6% or steeper grades with a combined 33-35K.

Well here lies the problem. THEY DON'T MANUALLY SHIFT THE TRUCKS IN THESE TESTS!!!!


I am not saying that regular mode does not work the best, and it does work the best if you manually shift it. However, if they want the truck to do all the work(like they do in these tests) then auto mode is the mode they need to be in.

When the trucks didn't make big power I found these tests interesting. I still didn't buy the winning truck. I no longer even find these tests entertaining......I never watched the video but it is quite obvious from your comments that test was useless. I suppose if they conducted an acurate towing fuel economy test where they started with a clean dpf and ended with a clean dpf it might be interesting. Maybe the towing up a hill is of value to guys towing 28000 lbs but my guess is that the slowest truck on one hill could be the fastest on another. So again the uphill tow test is pretty much useless.

I agree. Towing a 12.5k lb bumper up the Ike may be challenging for a gasser 3/4 ton, but not for any of the diesel mills. They just make it a "non event" which is what you want out of a tow vehicle. Maybe bumping it up to around 16.5k lbs or better yet a 13-14k 5th wheel might make the test a little more interesting.

However, I understand that they can only work with what they got. The trailer they have may not be able to carry 16.5k and the 3/4 ton trucks that the manufacturers provide them may not have the hookup for a goosekneck or 5th wheel.

4x4ord wrote:
I suppose if they conducted an acurate towing fuel economy test where they started with a clean dpf and ended with a clean dpf it might be interesting.

Winner winner chicken dinner... Yet every diesel fuel economy comparison fails to even touch on regen frequency and duration which have a bigger impact on economy than anything else.

N-Trouble wrote:

4x4ord wrote:
I suppose if they conducted an acurate towing fuel economy test where they started with a clean dpf and ended with a clean dpf it might be interesting.

Winner winner chicken dinner... Yet every diesel fuel economy comparison fails to even touch on regen frequency and duration which have a bigger impact on economy than anything else.

I can guarantee you that the DPF's were getting hot enough to passively regen up that hill. Anytime you are at high load for periods like that will trigger a passive regen due to the DPF getting hot enough without the use of extra fuel.


It is mainly when you are not towing or with a light load that the DPF needs to inject extra fuel to actively regen in order to get hot enough to oxidize the PM in the DPF.