In addition to the Insight, another 'king of MPG' is the Audi A2 TDI 1.2 (the so called '3L' model).
There is only one registered on fuelly, but the vehicle is designed to do 3 litres / 100 km (hence the '3L' badge). Sadly only manufactured between 2000-2005, and only sold in a handful of countries. It was ridiculously expensive to manufacture thanks to features like the magnesium alloy wheels.
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