Sudden mileage drop with diesel
2007 5.9 4x4 2500. I usually average 15-16MPG with mixed driving. Last tank was just over 11. I can think of some not optimal conditions on this last tank, but nothing to justify a drop like that.
Truck throttle response hasn't seemed to change, no check engine lights, and no black smoke.....Just garbage fuel economy.
Check your intake make sure the filter is clean and all components are tight no air leaks. Then plug into a computer and check your ECMs fuel system readings see if you have a possible problem with and injector or a possible partial blocked fuel line
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