Did freightliner intentionally set out to make a crappy automatic transmission?

Another thing to consider is the parameters of the ECM. Perhaps progressive shifting is turned off.

 

Haven't found one that covers driving a DT12 that is locked in eco- mode with manual mode disabled.

My average mpg is 6.6 and I am rarely at gross. Eco-mode FTW!!!

 

iShift > DT12

 

Ok driver. Drive your truck the way you want. I'll take my 2+ MPG more than you any day and still run for profit month. Speeding isn't going to get you 2 extra loads in a week, unless they are 100 mile trips.
You mentioned you drive for Prime. That means you can only go 68 mph, maybe 72 mph. Your average will be much lower. I guarantee you if you dropped your cruising speed to 65 or a little less, you'd see the fuel economy go up. Your "hammering" isn't that much faster than what I do and you're not gonna sacrifice any additional loads.

But hey, it's your money. Best of luck.

 

The I shift Volvo I drove didn't have a creep mode that was anywhere near as good as the DT12, otherwise I would agree with you. The DT12 creep is like driving a torque converter equipped car, foot off the brake in gear and she smoothly rolls along. It's a godsend when backing.

Both are way better than the herky-jerky system in the Paccar MX13 Kenworth though.

 

Blame your company, not the truck.

 

I was just thinking "when did freightliner start manufacturing transmissions and how did i miss that memo?!"

 

In eco mode it should not go to 2100 RPMs for upshifting normally. It can sense the load on transmission are change shift point.. Freightliner also has a special option on some trucks. The pedal has preformance mode. When you push pedal to the flood it stops. Then if you push harder it will go a little more and put engine into preformance mode and shift at high RPMs every gear.

So if your truck has this and you just push the pedal to the floor every time it will shift at 2100 RPMs

 

Exactly. It seems to be more of an issue with how your company crippled the truck than any problem with the DT12 transmission.