I've driven a couple of these cars, and "underpowered" doesn't really do that 66-horsepower 3-cylinder justice. In fact, the only post-WW2 vehicle I've ever driven that was slower than the Justy was the VW Rabbit Diesel my high school used for driver training ...

The Subaru Justy houses a 3-cylinder, 12-valve engine, with double overhead camshafts and Dynamic Variable Valve Timing (DVVT). It produces 69.3PS or 51kW at 6,000rpm and 94Nm (69.3lb ft) at 3,600rpm.