Is 10 MPG Possible with a Fully Loaded (80K gross) 5 Axle Truck?

Yea , I don't think that would help.
With sugar your will just make all the surfaces sticky and that will increase the friction.
Better to stick to the Micro Blue.

On a serious note I must say I was surprised at the gains but the statement all about frictional losses only being about 10% is inaccurate.
You just have to ask you self what usable HP is lost between the flywheel and the wheels on the ground.This difference is just the loses from the clutch, transmission,UJ's , rear ends ,rear wheel bearings,seals, brake drag and rear tires.
The rule of thumb is 80% of power at the flywheel gets to the wheels.
So if you could eliminate the loses completely (nearly all from friction) then from 80% to 100% at the wheels is a 25% increase in usable power.

What has to be kept in mind is the speed you travel at.
As speed increases the energy (Fuel) needed to overcome the wind resistance does not increase proportionally.
It increases depending on the aerodynamics at a faster rate then the speed increase.
So at racing speeds the energy just to move the air and overcome drag can become so huge that it relegates friction down to a much smaller percentage of the total loses.
Therefore as a percentage of total energy consumed you can't list anything as a constant when the single biggest factor is a variable.

 

I don't know why they don't offer it here because of the emphasis on fuel economy here, although one reason I can think of is we only generally use one drive axle so the savings may not be as much, possibly (and I'm guessing) 30% less than you are currenly getting,

I apologise if I seem like im running you down, I'm not! I'm just having trouble getting my head around your figures, I'm having trouble believing that something so small can make such a difference! (i hope my fears are wrong)I have massive respect for you and the efforts you are doing and how you are reporting back to us! This industry needs guys like you! Forward thinking, hard working intelligent guys like you! Although I'm in Ireland we are fighting the same battle; fuel price! It's the single biggest cost here, and in large companies here that's affecting wages of drivers( which is wrong), for the owner driver like us it's our livelyhood !

You are so correct, fuel prices are going one way , up! It's a sad fact that here fuel economy is taking precedence over realability , that's why the likes of daf, iveco, Renault and other manufactures survive here, in fact we only have three good truck builders here, scania, Volvo and mercedes, after that everything else is rubbish,

 

Bearings and other parts polishes themselves when you drive them in. Racing teams use all kinds of special finishing because they have no time to do break-in. And, if your lubrication works, you have no metal to metal contact. Polishing prevents oilfilm breaking and that makes it possible to use lighter oil and tighter tolerances, but that's big buck racing stuff.

 

Google flywheel vs wheel Hp.
There are various articles and even some calculators.
None claim to be 100%.
Rule of thumb , yes.
Your racing friends will know this.

 

My truck was dynoed at german MAHA dyno with roll down test, it showed 6 % transmission losses at 754 whp. Highest we have seen was something like 12 % from twin screw with hub reduction axles.

 

Did they remove the engine?