For kicks I also tried to get a sense of what a 300TD turbo do for mpg with a 5-speed manual transmission. All but the last line (my estimates) are taken from the 1983 tech data manual and are converted to US mpg for DIN city / steady 90 kmh / steady 120 kmh:
300TD (non-turbo, 3.46 rear)
4sp 24.3 / 30.2 / 22.6
5sp 24.3 / 33.6 / 24.8
auto 24.0 / 29.0 / 21.4
300TD (turbo, 3.07 rear) auto 22.6 / 29.4 / 21.6
5sp (est) 23 / 34 / 25
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1983 240D automatic, Orient Red, 174K
1983 240D manual, Biscayne Blue, sold at 341K
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