Even the Germans in 1938 were faster with a Car on the "Autobahn" :D
"Driving a Mercedes-Benz W125 Rekordwagen, essentially a W125 with streamlined bodywork and a larger engine, Caracciola set a new average speed of 432.7 kilometres per hour (268.9 mph) for the flying kilometre and 432.4 kilometres per hour (268.7 mph) for the flying mile..."
-https://en.wikipedia.org/wiki/Rudolf_Caracciola
"Driving a Mercedes-Benz W125 Rekordwagen, essentially a W125 with streamlined bodywork and a larger engine, Caracciola set a new average speed of 432.7 kilometres per hour (268.9 mph) for the flying kilometre and 432.4 kilometres per hour (268.7 mph) for the flying mile..." -https://en.wikipedia.org/wiki/Rudolf_Caracciola