First off I'm not a diesel tech just a driver. So, here's the rundown. I had a 14 t680, 450hp Cummins, 10 speed automatic with the aggressive shift tune, daycab, 170k miles. Over the past 6 months I have averaged 4.3 to 4.7 mpg.
Now I have a 15 t880, 485hp Cummins, 10 speed manual, daycab, 60k miles. For the past week I have made the same runs and cant get any better than 3.8 to 3.9 mpg
I'm not sure if the motor is the same size, but gearing and tire size is the same on both trucks. I'm not getting any codes and truck was completely serviced 4k ago.
Any ideas? Thanks
T880 with bad mpg.
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by J Rich, May 28, 2018.
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Running the southeast, conditions are nearly identical. Same driver, loads, traffic, terrain, empty weights are the same on both trucks about 40k gross is the same 80k. No fairings. The trucks are nearly identical t680 450hp, 10 spd auto, 4.3 to 4.7 mpg and t880 485hp, 10 spd manual, 3.8 to 3.9 mpg.
The valve adjustment maybe what I'm needing. We just bought the truck 2 weeks ago from a rental company probably no way to know unless it's on record with KW.
Here's a pic of the t680 and the trailer. The t880 is identical other than what separates a 680 from a 880 and pulling the same trailer. -
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