1. Porsche 962 – 251.815 km/h (1985)
This record average speed was achieved during 1985 Le Mans qualifying and even 30 years after, this is still the fastest average lap speed. The record was seth with #2 Rothmans Porsche 962C, driven by Hans-Joachim Stuck. His qualifying lap time, which earned him pole position, was 3.14.80.
In the race, Stuck was sharing the car with Derek Bell and they finished third, seven laps behind winning #7 Porsche 956B of Joest Racing, driven by Klaus Ludwig, Paolo Barilla and John Winter.