It's worth noting that I live at a ~200m elevation relative to work, and I have to drive that elevation 1,5 times both ways. This certainly hurts for the milage on the petrol-cars, in particular the Aygo, the TDI is the only one close to it's claimed consumtion in my experience. Had I lived somewhere flat, things might have looked different, the TDI would get even better milage than claimed, and the Aygo would probably do better to, though it's claimed mixed cycle I haven't even been able to match on long, calm trips.