dieselnation - does your 84 really only have 86k mi???
if so it's only broken in , barely, me thinks..

in my 84 300d t with 186k running straight citgo diesel
with no additives im getting abt 24-25 mpg with mixture in
town and highway driving. it seems to get better mileage
when the outside temps are above freezing.

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1984 300D Turbo - 231k....totalled 11/30/07 RIP