sport auto is a German automobile magazine, established in 1969, published monthly by Motor Presse Stuttgart, based in Stuttgart. The magazine publishes its "Supertest" of cars, featuring the laptime at the Nordschleife. Until 2015 almost all supertest were done by Horst von Saurma, from 2015 laptimes are recorder by Christian Gebhardt. The magazine also runs a challenge for the fastest lap time driven with a car that is road legal (TÜV) and registered in Germany. The road legality rule also applies for the tires.