Just went you thought there couldn't be any more questionable Nürburgring lap records, Toyota has announced the Prius Plug-in hybrid has become the most fuel-efficient car to lap the green hell.

Just when you thought there couldn't be any more questionable Nürburgring lap records, Toyota has announced the Prius Plug-in hybrid has become the most fuel-efficient car to lap the green hell.

The so called record was set by Joe Clifford who completed the 12.9 mile (20.7 km) long course in 20 minutes and 59 seconds. While that's laughably slow, Toyota says the Prius ran mostly on electricity so it effectively averaged 698 mpg UK (581 mpg US / 0.4L/100km). The company goes on to say the "record" was set during a public session, so the car had to deal with traffic and all circuit rules including the minimum average speed of 60 km/h (37.2 mph).

According to Clifford, "Although the 12.9-mile distance is similar to a typical commuter trip, the difference here is a rise and fall in elevation of around 1,000 feet. In fact it was only on one long climb that the petrol engine cut in, and then only for a short while. Without that, we think we might have even achieved the ultimate 999.9 mpg read-out – the highest figure the display can show."

Toyota Prius Plug-in hybrid sets fuel economy record on the Nurburgring [video]