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I have also a 35i, but Ive never really noticed the gas mileage, but I might remember seeing a 21.4 mpg. 100% city, no highway. Which is not that bad.
I own german cars, and maintenance stuff to do for gas mileage. :
- spark plug
- coil packs
- carbon buildup clean
- injector ultrasound cleaning
- air filter ( on the x3 its getting dirty very fast)
- BMW approved syntech oil to avoid sludge and wear. Also see if its not overfilled.
- pneumatic wategate , check for leaks and if its free moving. underboost or overboost will change the mpg.
- gas filter, but on the x3 its in the gas tank , so I guess ''a lifetime filter''.
- good gas 91 or more octane so the timing will remain constant.
- tires and air pressure.
- full charged battery and good quality battery to remove load on the alternator.
Also on a new used car, changing all fluids might not increase mpg, but can be great for the car. (transmission/coolant/brake/diff/transfer case/steering/engine oil)
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