Fuel efficiency sucks

My 04' Zx5 is sucking back the fuel, I get around 12L/100km with 165000 km on the odo. What could be causing this? I have replaced the spark plugs and wire anything else I should look for. I also still have the winters on.

I am buying a new car in the fall so I don't want to put too much into it

Lousy Smarch weather!


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