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I bought my car about 5 or 6 months ago and have been noticing that I have only been getting 240-300km to a tank, all city driving pretty much under 80 kph 90% of the time. Doing all highway i could manage 400km to a tank

This seems pretty bad, but i blew it off dismissing it as me being new to manual and the amount of city driving i do. I have tried to keep the rev's pretty low and still only hit the higher end of that range. (Car was originally from Alberta)

I have replaced all the spark plugs and flushed the engine for carbon build up, still no difference. I am also running new tires.

My question, is this km bad considering its all city driving, and if it is what should i look to improve it?