seriously?????? imho the effort put into driving fast to close it would maybe better spent stopping paying attention and closing it manually, just incase something happens and you don't see it wiping yourself out or more importantly hurting someone else. :-/
serious? Hurting someone with a fold-back filler cap, that doesn't stick out any further than the door mirror in front of it? I think even an H&S officer would have trouble keeping a straight face if they had to read that out....
For Eirik, my guess is that the upright windscreen of the standard Mini generates a vortex that travels back along the sides of the car so there isn't smooth flow down the sides that would push the cap shut - unlike a BMW with a fully raked screen that won't have much of a vortex.
Citroen DSs ('real' ones, like a DS21) shed a spectacular vortex off the base of the screen and it gets reinforced by the sloped tail - there's a photo somewhere of one being driven through leaves that show up the two huge vortices trailing behind the car.
In the last few days of driving on salted roads, there have been some amazing dirt patterns on the side of my Roadster that I never saw on my Convertible which would just be dirty, so I guess the Roadster's screen rake has some effect.
And the shaped filler 'cap' of an S may have less drag than the flat cap of a BMW, so it may need a higher speed to create the same closing force.
Technical enuf for ya?