Getting Better Fuel Mileage

ever check out that pyrometer

 

european drivers lugs to 1100-1000 very often,cruising at 1300-1400 and peak torque of diesels a constant from 900/1000-1400/1500(well at least specifications sad that)
max speed is 88-89km/h
and Peterbilt 372 looks weird but i wouldnt say its ugly

 

in EMD diesels there is
a electric lube pump which work after the engine shutdown and lube turbos bearings

 

I'm getting ready to buy a an 08 Western Star 4900ex, 515 hp, detroit 13 speed trans, 3:42 rears 24.5 rubber, any idea what kind of fuel mileage i can expect to get??

will be running western states hauling 20,000 loads..........

 

Should be 7 or better depending on trailer type, idle time and most important your driving habits.

 

Oh, yeah.......

Reefer trailer, 65-70 mph...It'd be great to set the cruise at 75, but I know that will drag the fuel mileage down...so I'll try to get by at around 67-68

I'll be pretty stoked to get 7mph...

Anything over 6 will make me happy.....

As long as it's not 5mph.

It has a factory installed Alliance apu, I don't know anything about that apu.

I've had Thermoking apu's in the past.

Anybody know if the Alliance is any good?

 

Excellent post.

1) i think the pete 372 was THE most aerodynamic tractor ever produced---not KW's t-600 or any of the current freightliners.

But my question concerns climbing mountains:
i know you say and most of the engine manufacturers say that you should go all the way down to 1100rpm and stay there as long as possible when you are mountain climbing.

HOWEVER, don't you feel that the engine would be under much less stress at higher rpms---say 1500-1650 ish when climbing hills even though the engine makes more torque and uses less fuel at lower rpms?

To me, i would rather pay a little more thru the stacks if i can delay a overhaul/rebuild for as long as possible. It just seems easier, and in the long run cheaper, that way.

 

P.S. Enjoy this tech paper from peterbilt of all people----who would have thunk (aside from the 372) that peterbilt even gave a plop about aerodynamics?

http://www.peterbilt.com/eco/pdf/Aero WHITE PAPER-2.pdf

 

The Columbia / Benz Combo pulling 24' double, average is about 5.75. Funny thing before they turned them down to increase fuel mileage I was at 6.50.

They want us up-shifting at 1700 and cruising at 12 to 1300. Maintenance also way us to drag them down to 1100 before down-shifting. None of this creates any problems in fact it runs cooler on the grades, but it has no real affect on the mileage.

My trailer are round, and just barely above the cab. 90% loaded to 79500. 27.5 tons in the wagons.