Red Bull's Helmut Marko has responded to claims that midfield teams are actually fielding the very best cars in 2012.In May 2012 Germany's Auto Motor Sport cited GPS evidence which shows Williams and Sauber have the most aerodynamic cars. The data was based on information collected during the Spanish GP.At the Monaco Grand Prix, Sauber's Sergio Perez recorded not only the fastest lap of the race, but was reportedly the quickest circulating car "for long periods", according to team boss Peter Sauber.Journalist Michael Schmidt said: "With Fernando Alonso, Sebastian Vettel or Lewis Hamilton in the cockpit, Williams or Sauber would probably be leading the championship."Red Bull's Marko responded: "They have good cars, but no one knows why. They are not as highly bred as a Red Bull or McLaren, but apparently easy are to drive and understand. In the present situation, anything is possible."