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Audi 100 2.5 TDi (C3)
Found something interesting recently:
In 1989 Audi wanted to see how efficient they could get a car.
For this purpose they piched a not exactly small Audi 100 and the (then) new 2.5 TDi 5-cylinder engine. (1T, 265 Nm, 120 PS)
Now the combination of large engine and large car isn't exactly what we would call a good starting point for great fuel efficiency, yet they managed to get 1,76 L/100 km or about 134 mpg /US) with a guy from the TÜV sitting on the passenger seat.
They modified it a bit and drove very efficiently for 4818,4 km and 80,05 hours.
The gearbox has 20% longer than stock, the low rolling resistance tires where pumped up to 4 bar, and the car mostly cruised at 60 km/h and 1100 rpm.
A CD od 0.30 might not be great these days, but in 1982 it was great.
We rarely see efficency like that even today and here.
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