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Trucks [ Eighteen Wheelers ] Roll On Big Mama. Forum/Discussion about Eighteen Wheeler Trucks. What truck do you like or dislike? Is your favorite truck a Mack, Peterbilt, Kenworth, Marmon, Volvo or Freightliner? Which diesel engine do you prefer; Detroit Diesel, Cummins, or...

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  #21  
Old 07.04.2008
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MaxEffort is there a number to reach you at?
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  #22  
Old 07.05.2008
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Well stated information, accurate info Maxeffort. Sounds to me like you've been to the old Bernie Dempsey spec'ing classes if you know what I mean. I'm thinking you and I attended the same classes years ago in a certain midwest river town, right?
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  #23  
Old 07.05.2008
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Black smoke means money out the pipe? Well ive never, guess im gonna turn my down to 410hp. I bet ill be getting 3mpg then, i was getting 3.5mpg with it set to 525hp..... Bridge CAT. Now i got 5.7mpg average on my last west coast trip, with sky high exhaust temps do to small turbo and not enough air. With the big turbo i expect to average 6mpg running west. This is with a W900 KW with 6 feet of space between sleeper and trailer. See signature.

Oh and running 70+mph.
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  #24  
Old 07.05.2008
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I've driven aero trucks that only got around 5.8 mpg, and I've driven big square nosed trucks that got 7.2 mpg. Most recently I was driving a DD15 Cascadia that only got around 6.8. I was disappointed in that. I was driving a 379 Pete/475 C-15 last year that got 7 on the nose. I HAVE driven a Western Star 4900EX with 515 Detroit that got 7.2. Seems to me it's more about spec'ing the truck for the job and not driving like a moron. Progressive shifting helps. Oddly enough, the trucks with more power tended to get better mileage... probably because they aren't working as hard, keeping more power in reserve.

In my opinion, if you take a truck that was spec'd to run 70 mph and cut back to 60 to try and save fuel, you probably won't see any difference at all, since you took that truck out of its sweet spot.
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  #25  
Old 07.06.2008
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How does the Prostar hold up compared to other trucks.

Here's an artical that supports the Prostar:


[LINK POSTED BY MEMBER] Only Members Can View This Truck Forum Link.
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  #26  
Old 07.06.2008
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Just wanted to thank Maxeffort for the fine job! A comment concerning cruise control...there is research going on that is trying to have an input to cruise from a gps unit. In this manner, the cruise system would receive information concerning terrain and make adjustments based on anticipated downhills and uphills...something to watch.

I have a white paper from Cummins on fuel mileage increases "The Secrets of Better Fuel Economy
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  #27  
Old 07.09.2008
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Quote:
Originally Posted by Captain Canuck View Post
I've driven aero trucks that only got around 5.8 mpg, and I've driven big square nosed trucks that got 7.2 mpg. Most recently I was driving a DD15 Cascadia that only got around 6.8. I was disappointed in that. I was driving a 379 Pete/475 C-15 last year that got 7 on the nose. I HAVE driven a Western Star 4900EX with 515 Detroit that got 7.2. Seems to me it's more about spec'ing the truck for the job and not driving like a moron. Progressive shifting helps. Oddly enough, the trucks with more power tended to get better mileage... probably because they aren't working as hard, keeping more power in reserve.

In my opinion, if you take a truck that was spec'd to run 70 mph and cut back to 60 to try and save fuel, you probably won't see any difference at all, since you took that truck out of its sweet spot.
The most aerodynamic truck is a cabover...you wouldn't figure that but it is. The big flat front forms it's own bubble in front of the truck.

Spec'ing for the job is important. A lot of little details can make a difference.

60-70mph?
You would save about 1 mpg maybe more. You cannot get by the aerodynamic horsepower demand.

Aerodynamic horsepower demand increases by the cube of speed. Think of that as an ever increasing grade that as you travel a little further it goes up much steeper
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  #28  
Old 07.09.2008
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Quote:
Originally Posted by 550hpW900L View Post
Black smoke means money out the pipe? Well ive never, guess im gonna turn my down to 410hp. I bet ill be getting 3mpg then, i was getting 3.5mpg with it set to 525hp..... Bridge CAT. Now i got 5.7mpg average on my last west coast trip, with sky high exhaust temps do to small turbo and not enough air. With the big turbo i expect to average 6mpg running west. This is with a W900 KW with 6 feet of space between sleeper and trailer. See signature.

Oh and running 70+mph.
Yeh, I like hopped up trucks too, but it's your money at $4.50 a gallon.
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  #29  
Old 07.09.2008
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Quote:
Originally Posted by e500gvr View Post
Well stated information, accurate info Maxeffort. Sounds to me like you've been to the old Bernie Dempsey spec'ing classes if you know what I mean. I'm thinking you and I attended the same classes years ago in a certain midwest river town, right?
Thanks

I don't know about Bernie Dempsey, but I'm sure he did a good job. the facts and the math are pretty much the same if explained properly.
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  #30  
Old 07.09.2008
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Quote:
Originally Posted by NealinNevada View Post
Just wanted to thank Maxeffort for the fine job! A comment concerning cruise control...there is research going on that is trying to have an input to cruise from a gps unit. In this manner, the cruise system would receive information concerning terrain and make adjustments based on anticipated downhills and uphills...something to watch.

I have a white paper from Cummins on fuel mileage increases "The Secrets of Better Fuel Economy
Thanks.

I would like to read Cummins take on the subject.
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