Need some advice here! When I first purchased my smart I was getting 4.6 l/100 and lately it's been creeping up all the way to 5.3! I was expecting the number to go down as I broke it in, not up! I checked the tire inflation, the oil level, and put a K&N air filter in too and no improvement.
It's going in for its first A service tomorrow but I don't expect they'll do anything other than change the oil, right?
Does anyone have any suggestions? I saw a reference to a clogged EGR valve somewhere - could that be a possibility?