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Fuel Mileage sucks - need help

I have million mile Volvo 670 with D13 engine. I was happy with MPG between 7 and 8 from 0.5 million to a million. But then it went below 6.

Last year I replaced injectors and turbo. Less than a month ago changed Crankshaft Dampener, cleaned EGR cooler and replaced Charge Air Cooler.

MPG did improve but still around 6 which really sucks. Oil analysis doesnt come up with any issues.

How can I get the MPG back to where it was?

Thanks

Answer this question I have this problem too

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4 Answers

DPF filter maybe? Did you have the overhead run as well?

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DPF shows low soot. I am not able to think what else to check but I have to get to the bottom of it.

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Yes, overhead was also done.

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Replaced intake manifold pressure sensor and that should help further reduce fuel consumption

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satty will be eternally grateful.
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