My new Ford Mustang GT 2011 is a real sucker when it comes to fuel consumption. When I drive enthusiastically, I get 20 l/100km. When I drive normally I get about 15 l/100km. The best I could ever muster, for a brief period of 10 minutes, was 9 l/100km, when I was driving to Osoyoos. The moment I started entering the mountain passes that figure dropped to 10 l/100km.