Best MPG grossing 117,000 pounds

Just to give you an idea. ( might be useless information lol )

I have a performance ISX15 550hp/2050tq Cummins and I run 120,000lbs and average 2.9 - 3.8 MPG depending on hills.

 

One of my trucks used to run that kind of weight/ 12.7/18/3.90. Think he said he was under 4mpg average.

 

That kind of weights usually create a fuel burn of gallons per hour rather than how far you can go on mileage per gallon. It would take all the older two strokes could give and then some in those days.

Goes without saying the more horse you have on hand the less work you have to do. So for that kind of weight I'll be looking to see if there are 750 HP or better engines in the USA.

 

We haul 140,000 lbs, 65-70% loaded.
Some guys get just under 4 mpg, a few break 5 mpg in the summer.
Trucks at 500 hp or less seem to average better overall. Yes they are slower, but horsepower costs fuel.

 

If your going for pre eld I would make sure the drive line is up to the task before I even worried about mpg at near 120k.

You have a pre-eld C already. You know the truck and its quirks, why start all over again.

 

Ok I got you. What's the specs? Trans, rears, tire size?

If you have the cash a 5ds '98 or 1mm '99 is what I'd be looking for. Good luck though

 

Since you’re going pre-eld, I would completely go through the running gear before it hauls a load. You don’t want to be packing weight with tired transmission and rears.

A 12.7 at those weights could make for a long day.