Dejanh,

I have nothing against FTL Columbia ... the purpose of my post was to demonstrate that when the truck is not spec'ed right for the job (as is the case with my Columbia), the fuel mileage will be poor no matter how slow you drive. The fact that my boss further turned down the limiter to 62.5 mph (both on foot and cruise) means they were not even getting 6.5 mpg when we were allowed to do 65.

44,000 lb loads in hilly terrain can do that to you, no doubt.

Columbia 2006
Mercedes 450 hp @ 1900 rpm, 1550 lb-ft torque @ 1200 rpm
3:70 rears, 10 speed autoshift
Frequent visitor to: PA, NY, KY, TN, NC, British Columbia, Alberta

 

How come in this "saving money -rate of speed" discussion no one ever mentions that a truck may hold up longer all around if driven slower?

 

Cause the point of discussion, was "Fuel savings"? :P
But of course you are right, on that one! 8)

 

Not to make this a religious discussion but, AMEN!