adamb, yes I want to think that the improved fuel economy was due to a fairly decent wind on Sunday returning home on a highway run from the NJ Diesel meet and that combined with one long climb to the astounding altitude of approx 1000 ft above sea level ... but
i'm still wondering if somebody (turbodiesel??) put a good fuel economy or some sort of other spell on my car at the meet to explain this phenonema !
seriously-
my highway speeds were between about 70 and some bursts upto about 95mph and fuel is the same as always straight Citgo diesel. maybe the changeover from winter to summer diesel has a bearing on mileage?

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