4.5 Duramax Video

[Silverado4x4]

Not much info but its something, check it out.

[MS3DALE]

Cool,Thanks for the link.

Thats going to be my next truck!!!

I've already got people inline to buy my '07!

[s-ten]

Interesting.

 

I am anxious to see how it performs when it comes out, as well as the added cost to the trucks.

[07SilveradoClassic]

it is interesting how they reversed the intake and exhaust

[gave20]

Ehh, I'd rather see a 30-40 MPG diesel than one with 625 lbft of torque, 99% of the 1/2 tons on the road are daily drivers with little towing or hauling. I'm curious if they put an Allison behind it cause at the moment the MYD tranny is only good up to 531 lbft.

[pm26]

Ehh, I'd rather see a 30-40 MPG diesel than one with 625 lbft of torque, 99% of the 1/2 tons on the road are daily drivers with little towing or hauling. I'm curious if they put an Allison behind it cause at the moment the MYD tranny is only good up to 531 lbft.

 

30-40 MPG?

 

You are dreaming. Not in a 6000-6500 lb vehicle. For comparison, the new Mercedes CDI diesel available in the ML SUV gets about 23 MPG. And Mercedes knows how to build a diesel. And it is a smaller displacement, lower power motor than this Duramax. And the ML SUV weighs around 4200 lbs and it a lot more aerodynamic than a GM full size pickup.

 

http://www.edmunds.com/insideline/do/news/articleId=105638

 

If the laws of physics change, i.e. more power, more weight, and more drag = better fuel economy, then maybe.

[tobias]

Ehh, I'd rather see a 30-40 MPG diesel than one with 625 lbft of torque, 99% of the 1/2 tons on the road are daily drivers with little towing or hauling. I'm curious if they put an Allison behind it cause at the moment the MYD tranny is only good up to 531 lbft.

 

30-40 MPG?

 

You are dreaming. Not in a 6000-6500 lb vehicle. For comparison, the new Mercedes CDI diesel available in the ML SUV gets about 23 MPG. And Mercedes knows how to build a diesel. And it is a smaller displacement, lower power motor than this Duramax. And the ML SUV weighs around 4200 lbs and it a lot more aerodynamic than a GM full size pickup.

 

http://www.edmunds.com/insideline/do/news/articleId=105638

 

If the laws of physics change, i.e. more power, more weight, and more drag = better fuel economy, then maybe.

 

 

I don't think 30-40 is out of the question. My friend's Cummins-powered Ram 2500HD often gets 20-22 MPG. Most diesel truck engines are built specifically to produce power and provide towing capability. With the sky-rocketing fuel prices, it's not hard to imagine diesel engines built with fuel economy placed before raw power. It's also not hard to imagine lines of people waiting to buy one. Albeit an entirely different beast, the VW Jetta TDI (3197 lb) has been known to get 55 MPG. A 2008 GMC Sierra 1500 Extended Cab 2WD SLE2 Standard Box weighs around 4923 lb.

 

It's obviously not a simple as figuring MPG/lb but it's not inconceivable either.

 

I do think it's funny though that the Hollywood elite run around driving the Prius because the word "Hybrid" is cool when they should be driving a Jetta.

 

Daddy

[VTSierra]

A 2008 GMC Sierra 1500 Extended Cab 2WD SLE2 Standard Box weighs around 4923 lb.

 

 

One thing to keep in mind is that the diesel engine and heavier driveline will add at least 500lbs to that, if not more.

[pm26]

Remember the Jeep Liberty CRD diesel fiasco? They only made it for several years. Besides being troublesome, the fuel economy was very disappointing. Some got only 15-18 MPG at most. And this in a small 4X4 jeep SUV, which is a lot lighter than a full size GM pickup.

[gave20]

Ehh, I'd rather see a 30-40 MPG diesel than one with 625 lbft of torque, 99% of the 1/2 tons on the road are daily drivers with little towing or hauling. I'm curious if they put an Allison behind it cause at the moment the MYD tranny is only good up to 531 lbft.

 

30-40 MPG?

 

You are dreaming. Not in a 6000-6500 lb vehicle. For comparison, the new Mercedes CDI diesel available in the ML SUV gets about 23 MPG. And Mercedes knows how to build a diesel. And it is a smaller displacement, lower power motor than this Duramax. And the ML SUV weighs around 4200 lbs and it a lot more aerodynamic than a GM full size pickup.

 

http://www.edmunds.com/insideline/do/news/articleId=105638

 

If the laws of physics change, i.e. more power, more weight, and more drag = better fuel economy, then maybe.

 

 

 

I know your not going to get 30-40MPG out of the current motor but why put a high output motor in a half ton? Most of the LMM's are getting right around 20, not to bad for a 7000lb truck, if GM knocks the hp/tq number back they could get 30-40MPG.

[Truckin2003]

the oil companies pay good money to make sure that your not going to get 30-40 MPG.

[schase]

While vehicle wieght and aerodynamics are a large factor in a vehicle's fuel effecieny, the stringent emissions standards phased in by the EPA between 04 and 09 significantly limit the ability of diesel engine manufactures to calibrate engines for peak fuel economy. When this engine is introduced in 09 it will have both a Diesel Particulate Filter and a SCR (Selective Catalytic Reduction) catalyst to treat oxides of nitrogen. As the NOx standard continues to reduce to a eventual level of .07 gm/mi for Tier 2 Bin 5, the level on engine out NOx emissions must continually be reduced. In general, reductions in engine out NOx emissions generally increases the engine fuel consumption. Take away NOx emissions standards, and these engine have potential for substanial improvements in fuel economy.

[NathanL]

The thing about diesls isn't the mileage - but yes the torque. Mileage is a by product of that. I have a diesel. It gets 20mpg in a 3/4 truck. When I pull a travel trailer it gets 20mpg, when I pull a boat it gets 20mpg, when I pull a 5th wheel full of hay it gets 20mpg....that's the beauty of a diesel.

 

My gas engine truck gets nearly the same mileage when empty - then as you know goes downhill from there with more load.