Very strange how I went from 19 inch 235/265 staggered to 18 inch 225 all round and my consumption went up from 8+km/l to 7+km/l.. Only getting about 450-480km per tank now.
My 335i is 5.9km per litre for >80% urban driving. I thought it was bad until I drove the 520i loan car and found the fc is not too far off at 8.8km per litre which is proportional to the cc (50% higher cc results in 50% higher fc).
Mine is 100% stock. I think the poor fuel economy is due to the traffic conditions of my daily commute.Wow ! Your 335 drinking a lot of petrol. A lot of mods ? Mine is about 8-10 depending on how heavy i am on the foot. Lol.