on normal diesel ive done 38mpg, on the older "real" diesel 41mpg.
that is at about 60mph and long drives.

mixed aggresive driving they do about 33mpg

yes, al om617a (turbo) from 1985 had the 2.88 (in US), not in sweden thou/europe, so information might differ depending on what website you visit.
we never had the turbo in the coupe nor sedan w123 either, nor the w116 or w126 with dieselturbo

ps. Sweden diesel. might have more energy than the US, and the old "real diesel" is better than the one bought at pumps.

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daily: w123 om602turbo 5speed 200whp, w115 240d 3.07 differential
mbturbo.com turbo diesels+gassers in oldtimers/classics