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welcome aboard...
it is my understanding that the diesels are very thrifty... i get about 18 MPG on my 4.8is, which is very thirsty...
I do not know much about the diesels, but i would suspect that engine needs some loving - clean up the injectors or whatnot, couple hot oil changes, to see if there is any sludge built up in the engine... i do not know about glow plugs, but if there were spark plugs, i'd replace them too...
lets see if there are any diesel gurus out there who can chime in...
again, welcome aboard
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