The rubber bypass lines carry much, much, much more fuel than is actually injected...this just insures that fuel supply at the injector is always more than adequate....you cannot tell anything about how much is leaking past the injector based on how much is in bypass line. That would be like using fuel mileage to see if you have any fuel leaks!!

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)