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There was a known problem with intake manifold gaskets not sealing properly. Look into this (to pay someone to do it isn't cheap but a kit is only about $150 as I recall); if nothing else, pull spark plugs to see if any two are fouling from adjacent cylinders. The 318/360 isn't known for economy, but extra long service life.
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 2004.0 7,360-lb DODGE Ram QC/LB 2500 2WD/6-speed Cummins 305/555 ISB. Stock, except LEER bed topper and twin muffler exhaust. 180,000 miles at 4,625-hrs @ 39 mph. 15-cpm solo, 25-cpm towing. (22-mpg avg past 37k)
Fuel Log
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