I recently got my 2003 e39 520i second hand, at first it was all fine until I tried to start it last week. I noticed a quite strong fuel smell outside the car. I also just noticed that my fuel economy is lower than the usual e39 520i. I got around 19-20 l/100 km. I also noticed that my car is a bit slower than my friend's e39 520i. I didn't see any oil spill under the car. My car had only done 22000 km because the previous owner left the country and just recently got back. So far I have replaced the sparkplugs, tires, battery, and suspension. Please help, it is my first car.