DD13 Fuel Economy (OTR Application)

I ran a 2014 Cascadia with a DD13 in a company truck for two years then bought a 2014 Cascadia with a DD15 Evo motor and leased it to the same carrier. My fuel mileage actually went up 0.3-0.5mpg I have lot a more power and I like the engine better.

 

How heavy to you haul at?(gross weight)
See a difference in number off regens betwern the DD13 and DD15?

 

I’ve spent the last 3 months talking to every driver I’ve met in a ‘19 about fuel economy.

I’ve more or less come to the conclusion that I will be getting at least 7, and possibly more than 8 mpg. Weights varied. But most reported almost 8 when grossing 75k plus in the mountains. So long as they keep speeds below 65 mph. Sweet spot seemed to be 62 or 63.

I did have one guy admit to 6 or less in the mountains. But he also stated he stayed in manual most of the time. Otherwise, he got around 8

 

I really wanted a 13, but elected to go with the auto to reduce fatigue. Also past experience with the gearbox.

It’s a solid setup, unlike their past attempts. But I disagree with the premise of absolutely no reason ever to use manual.

Starting down a steep grade in auto is going to lead to severe engine damage for a few that are unfamiliar with it, and that allow it to run out before applying the jake.

While this may be an incorrect set up that was never addressed in the past. Pulling the jake to stage 3 at 70-80 mph down a grade (in auto) will result in finding 10th, or even 9th gear real fast. Over revving the engine immediately.

I suspect this was/is an inaccurate set up. There’s no reason that should happen. I hope this issue has been addressed by Freightliner.

And this actually happened to one of our O/O. He put a rod through a piston.