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Late injection timing will cause low milage, as will bad wheel bearings, draggy brakes, out of alignment condition, etc.
I wouldn't bother with injectors unless I was getting symptoms of a bad one (hard start, excessive smoke, serious injector knock). The ones in the Volvo have 220,000 miles on them and still work fine. Pop pressure is down a bit, but within the used nozzle range, so I'm not messing with them.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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