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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