I drive a E90 320 and pump Shell V power or Shell 98. I get average consumption of 7km/l on a mix of 50% highway / 50% city driving. I take ECP mostly but with the increased traffic flow, the average speed there tends to be rather slow at around 40km/h. I am wondering why my fuel consumption is still very high? Was told that average should be around 9km/l? Has anyone done better fuel consumption?