Everyone here likes to talk about running slow, so I'm gonna post about my trip from New Mexico to Boston, MA.

1997 T-600 3406E @ 475hp 3.73 rears, 10 direct. (I think...Its an RTX 14-6-10) 78,500# full of fuel.

Las Cruces, NM to OKC, OK running 72-76 mph in the 1800 rpm neighborhood - 5.57 mpg.

OKC, OK to Effingham, IL running 70 mph (except for IL - I ran 58) - 5.67 mpg.

Effingham, IL to Lodi, OH running 58 mph the entire way at around 1450 rpm - 5.35 mpg.

Lodi, OH to Willington, CT running 65 mph around 1700 rpm - 4.8 mpg.

And that 500 Detroit in my Classic would run ALL OVER this Cat.

 

RT.........The X means its an o/drive with the standard shift pattern. About .73ish ratio i think, guessing but that should be close.

The fuel mileage is a bit of a puzzle to me................like it should be reversed.

My Detroit would run all over this cat..............power or fuel? orboth?

 

Power mainly. The detroit was in a Classic XL and got 5.5 doing anything between 65 and 85 mph...made very little difference. But now its blowed up...again...and getting an N14.

 

:roll: to you too.

 

they make cummins for people who cant learn how to drive cats there, boss.

 

Well, I have to say, I drove a Cummins ISX in a T660 and it sure made every Cat I ever drove look like a....kitty.

Also, the N-14s we have will shame this Cat bad. But maybe I've been behind that Detroit too long to know how to drive a cat.

 

Well guys, you may say what you want, but I'm averaging above 7mpg on my Acert, and was getting as high as 8.1 mpg for OH-NYC-OH round, with the light load. My old 3406E, was getting around 6.75 average.

And about "pull", with 40,000lb in a box, i don't shift in PA on I-80.
And i didn't even push it, or speed up... 8)

 

I heavy haul so don't worry about MPG to much, if I get 3mpg I think it is good, but I traded a w900l 144inch sleeper with a 600 (tuned up Cummins) for the same configuration w900l with a tuned up 600 Cat and the Cat just snorts and digs deeper on a hill that I would have been grabbing gears on with th Cummins

 

Well, I just did Cincinnati, OH to Montgomery, AL to Hammond, LA - beating the hell out of this Cat all the way...with a very light load of 8,000 lbs in the box, but I mean I bea the hell out of it. The entire trip somewhere between 75 and 85 mph - thats 1800 to 2000 or 2100 rpm. She did 6.01 mpg. I thought these Cats did't like rpms?