I read somewhere (a long time ago) that extremely new cars would have a higher than rated fuel consumption. I don't see the logic in that statement now but I guess I still want someone to refute it. This was brought about recently because our BMW 320d was acting up, got fixed, went to pick it up, drove 5 metres and the engine cuts out. So we asked for a different interim car (was a 120d, changed to a 323i). So this 323i is a brand spanking new one, it was a service car and had 120km on the odo. So I'm driving this thing along in reasonable traffic in Sydney, and I'm having serious trouble getting the average consumption down from 17L/100 (13.84 mpg). The traffic did ease a bit and I was at 16.3 by the end of a 25 minute trip. (for comparison, in the same traffic our 320d would probably get 7L/100km or 33.6mpg). I mean, there is absolutely no reason that a 2.3L engine (or whatever size it is) can use that much fuel for commuter driving. Would the fuel usage go down as the car builds up a few km?