The problem there is how accurately this can be measured. Even if you run the comparison over several tankfuls for each mode using odometer miles and petrol pump gallons (which is about the shortest distance over which accurate results are possible), you can't be sure the driving conditions were the same for both - a difference of several mpg between two tankfuls that you think were driven the same is to be expected for things like weather conditions, temperature, traffic, etc.
- The injectors are dirty. Fuel system cleaner (a good one) will help.
- The back of the intake valves are dirty. Cleaning them requires removing the intake manifold and using a walnut blaster (its an official BMW tool, btw). Not cheap, but worth it.
With only 9K on the clock, I doubt if it's the intake valves, but it will need it eventually. Direct injection engines are a bugger that way.
I had to run three cans of injector cleaner through mine before the hesitation problem got better. I used B&G 44K, which lots of people swear by. Not cheap, but it seems to do the trick.
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