speeding jeep?

A bit chilly here - I can recommend the excellent wx.ca - you can see clearly that the weather is entirely driven by the wind direction. A couple of days ago it swung North - so a base of -15 or so with wind chill taking it down close to -30... Ugh. My trusty jeep is facing North - and the more observant will notice the snow has formed an aerodynamic exit structure around the back of it - who knows - I I made and attached one to the back - would it create a more efficient profile. Maybe Formula 1 teams are putting to much reliance on the boring wind tunnel - they really need to consider the -30 snow forming....