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Car is a 2003 Honda Civic Si with approximately 65000km on it. Full synthetic oil was put in 5000km ago, all air filters where also changed at this time.

I'm getting maybe 400km a tank, should be getting 200km more, could it be anything else than the fact I need an oil change?

 
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check your tire pressure with temp changes, but yeah it may more than likely be your need for an oil change or check your filter...

 
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oil filter and oil are to be changed sometime this week. Tires are new, just had them put on for winter.

 
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it could be just winter gas and more idling during the winter.

during the summer i can get about 550 km per tank 70% hw/30% city using summer gas. in the winter when they switch to winter gas with more lighter formulation, i get about 450 to 480 km per tank with the same ration of hw/city driving. but i do idle more cause of startup and winter traffic. i noticed this last year and i'm getting the same effect this year too. i'm driving a 2002 civic lx autobox.

 
Rep Power: 231

thanks man, good info.