2018 Pete 389 with Cummins X15

@gokiddogo

 

I figured it's getting 5.8 because of the flat top with a van. It also only has 5,000 miles on the truck so it should continue to get better.

 

I have the CM-871in a mid roof International ProStar, 7 to 8 mpg was not out of the norm, over 9 mpg pulling a flat. Even with that low of mileage I would think it would do better in you particular truck. I know they need to loosen up, but that sounds a bit low, even with the nose.

 

I have a 2016 389 with isx at 500/1850.
Pull 2 axle reefer almost always 78000-80000 Ontario to nj/pa/va and back and Ontario to bc/ab then Washington to Ontario. Winter around 5.0 mpg summer 5.5-low 6's. The weight is the biggest factor. I do a summer time run local 50% empty miles and average about 6.5 for that. 11r22.5 3.73 18 double over. Drive about 60-65 mostly. Only go to 70-75 going from west coast back to Toronto. 373510 km on it as of now and no major issues. Knock on wood. I only idle when it is deathly cold outside. Maybe 10 nights a year. Engine has 4941 hours giving an average speed of 75.6 kmh or about 46.8 mph. This engine seems happy running between about 1300 and 1500 rpm.

Would I buy another one? If gliders were not an option I would (at this point) say yes. Preventative maintenance will be expensive, but the flaws are known. So a turbo and actuator will cost me 10 grand I will replace at 400,000 miles. Same goes for fuel pump. Not sure if I will rebuild or replace but they have the same approximate life expectancy. Either one if they fail is likely to cause major engine failure. Alternatively you could buy a paccar engine which nobody will want when you get to resale day. I've heard it's a bit better on fuel but is a real slug.

 

Yours is "fixed" though, isn't it? I would be willing to bet that dpf is costing at least 1 mpg on the average..

Mine is still working as designed and fuel mileage is consistent, and I still owe money on the truck. I have no warranty left. Perhaps when it is paid I will mess with it. All the unsuccessful attempts scare me off a bit. And I'm not sure the 2350 has a guide like the 871 has.

 

You need to fix that truck, no reason you should not be getting close to 8 mpg with that truck. At the very least 7 mpg. Rawze.com... See Price's Diesel in Oxford PA, he can get you to that point, money in your pocket.

 

I would, they have a very real history of failing prematurely. And prematurely means when ever they feel like it.