A Toyota Prius Plug-in has returned a 698mpg fuel consumption figure on an economy run around the 12.8-mile Nürburgring Nordschleife.
The Toyota Prius Plug-in's claimed combined cycle fuel economy figure is 134mpg, but the petrol-electric hybrid almost completed the whole lap on EV power alone, with the 1.8-litre petrol engine only engaging during on a long uphill climb.
The car used for the economy run was upgraded to TRD (Toyota Racing Developments) specification. This includes lightweight 18in alloy wheels and low rolling resistance tyres, uprated suspension, aero-enhancing front and rear bumpers and a rear spoiler.
The run took place during a Nürburgring public track session, meaning the car had to comply with all the circuit rules, including the minimum average speed of 37.2mph (60kph).
The lap took 20 minutes and 59 seconds – more than three times longer than the production car lap record of 6 minutes 57 seconds set by Marc Lieb in a Porsche 918 Spyder hybrid last September.