8 mpg by driving 55

For all darn headaches these new trucks cause with egr, dpf, scr and stupid economy tunes @ super low rpm they should be seeing way more than 8mpg. Running light loads all highway miles with 4.42s i still get 6.6-6.9 @65. My dad runs 60-62 with the 93 and 3.91s and gets 8.1-8.3

Keep it up engineers your doing awesome/sarcasm

 

I drove deadhead from Vegas to NorCal with my new T680 and trailer. My mpg averaged 10.6 at 60 mph. I'm still not sure if I believe it.

 

It is its a glider 265 in. Wheel base heavy detroit motor

 

I pushed over 15 close to 20 at times downgrade eastbound at the Kansas Colorado line with a frontal storm passage pushing on the rig with greater than 70 mph winds off my 7 o' clock on the trailer like a sail. Broke 20 a couple times over that 100 miles or so. Had the century computer repeating the milege per gallon in near real time 5 second timing repeating.

 

I’m surprised my 99 Classic w/ 12.7 265 wb weighed 18400 w/half tanks. Current Classic 2000 w/ 285 wb 18700 / half tanks Full tanks still under 20 k ( no apu) Detroit’s quite a bit lighter than a Cat don’t know about Cummins

 

Did not realize you could permit multi piece heavy haul.

 

Tractors have gotten too heavy for their own good.

Used to be we could take 48K into a great dane reefer and just about gross it with fuel.

Im hearing that today's tractors have gotten obese.

 

That will go up probably. I believe it. That 16 Cascadia I just aquired got almost 13 pulling an empty when I went to get it.

 

Yes,thats it

 

My current 2015 Cascadia with a dd15/10 speed manual can get 8mpg if Im not to heavy. But My average is in the range of 7.5 to 8.

My previous truck a 2018 Cascadia with the dd15/12 speed auto would easily hit the 8mpg mark @ 60 and Id often see 9mpg. It wasn't uncommon for me to average 8.5 for a week.

If you are talking deadhead both could easily do 10mpg