I'm in the US and I drive a 2010 128i manual transmission and the worst I've gotten is 24 mpg dealing with daily commute with stop and go traffic. The best I've gotten is 30 mpg with straight highway driving at about 70-80 mph. I've done some tests and found that 60 mph seems to be a sweet spot and I used the real-time gas gauge to try and stay at 30 mpg and up. However that tends to get boring real fast. But driving habits determine how often you see the pump.
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