|     ISX 2350 485    |  
|    01-31-2017, (Subject: ISX 2350 485 )   Post: #1   |  |||
 
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|  ISX 2350 485    Hi anybody experiencing declining fuel economy with this engine? I have 200000 miles on it, boost goes to 38 psi runs great dynoed at 440 hp at the wheels, dpf filters are clean, started off at over 7 mpg now I'm down to 5.     |  |||
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