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Fuel mileage increase.


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On my last 2 trips, after replacing my rear leveling valve on my volvo d12, i saw an inrease of almost 1 mpg.


I also replaced my fuel water separator as well. Does this seem possible?


In addition, on my last trip we drove through many hills and i had an extra 1000lbs of hay. I always set my cruise at 67 and use it as much as possible??

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