[aerohead]

Originally Posted by Joris

One of the world’s four largest sustainability races – Een van de vier grootste duurzaamheidsraces ter wereld | Every august at the Sea Dyke in Den Helder, (inter) national student teams race against the wind. The world record is 96,91%,

Not very practical for everyday use, but it seems to be possible.

If the Montreal team's Chinook ETS was racing into a 5.5 m/s wind,we're talking 11.7 mph for the car.