my mpg is lower than it supposed to be?

[jasonbk]

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I managed to calculate my average fuel consumption over the last month..and it's not looking good

I averaged about 9.6km/ltr doing about 2/3 of downtown driving and 1/3 of highway driving.. I'm not a heavy footed either (rarely shifts at above 3.5k rpm) so I am quite surprised to the fact that I got so poor fuel mileage..considering it's got 1.6L m40 engine.

First reason that I can think of is that the car seems running slightly rich. I can smell gas (i think from exhaust) when it's idle. however there is no leak from anything and the smell goes away once I get it moving.

So my question is that, is it normal getting this kind of mileage? if not, what would be the problem?

[monkeyodeath]

Standard checks would be fuel pressure, O2 sensor, coolant temp sensor, and exhaust leaks. Any of those things can contribute to poor gas mileage.

[bmwguy325is]

Id say you lug the engine to much trying to be conservative. SO you shift early and use more pedal to keep the speed you have and accelerate.