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Old 01-27-2014, 06:46 PM   #29
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I did pull a Cougar High Country 299RKS (34ft & approx 9200 loaded) with an 08' GMC 2500 CC SB 4x4 6.0 w/373. The 6 speed trany was probably an improvement over yours but otherwise similar. It pulled well & averaged 8 to 9 MPG. I switched to diesel so I could use cruse control most of the time. The GMC kicked down in the mountains but always maintained speed & was going strong with 148K. I did have to replace 3 manifold bolts but otherwise just regular maintenance.
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Old 01-27-2014, 07:05 PM   #30
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Manifold volts are chevys dinner lol. Happens to all of em. Why they dont tell you that putting headers on fixes the problem. Maybe so you keep going back to the stealership lol.
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Old 01-28-2014, 06:46 AM   #31
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The unfair advantage I forgot to tell was that the Duramax , and others like Cummins and even the newer Ford 6.7 have a disadvantage due to the emission regulations. It really has taken the life out of these engines. I am not really sold on the need for all of those emissions or the fact they burn more fuel than their larger non emission engines.
My personal argument is that if you burn more fuel to clean emission gas aren't you in fact polluting more? Hummm? And what is the real emmision of say a 5.9 Cummins compared to a 5.7 hemi or 5.3 chevy and etc. ? I think we are being a little fooled with these emission changes. My 7.3 with 300 plus thousand miles gets 14 mpg real time and with the same trailer my new 6.7 ford gets about 8-9 mpg ? Plus mention I carry the blue DEF fluid that mixes in the diesel.. That stuff isnt cheap.
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Old 01-28-2014, 07:22 AM   #32
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Thats why i wont buy a diesel. Like i stated before for the cost of a diesel i can rebuild my trucks drivetrain many many many times.
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Old 01-28-2014, 10:35 AM   #33
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Quote:
Originally Posted by jonbrown View Post
The unfair advantage I forgot to tell was that the Duramax , and others like Cummins and even the newer Ford 6.7 have a disadvantage due to the emission regulations. It really has taken the life out of these engines. I am not really sold on the need for all of those emissions or the fact they burn more fuel than their larger non emission engines.
My personal argument is that if you burn more fuel to clean emission gas aren't you in fact polluting more? Hummm? And what is the real emmision of say a 5.9 Cummins compared to a 5.7 hemi or 5.3 chevy and etc. ? I think we are being a little fooled with these emission changes. My 7.3 with 300 plus thousand miles gets 14 mpg real time and with the same trailer my new 6.7 ford gets about 8-9 mpg ? Plus mention I carry the blue DEF fluid that mixes in the diesel.. That stuff isnt cheap.
I think you need to re-read this post. DEF does and I repeat does not mix with diesel fuel or in the engine. DEF is to help in reducing NOx emission; it is used in the exhaust system to help met the emission rules set for in TIER IV Final by the EPA. If you put DEF (UREA) in the fuel you have just scrapped your fuel system on the vehicle. Since DEF is a highly purity chemical compound; comprised of UREA and de-ionized water; it will destroy the fuel pump and injectors.

Jim W.
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