The best way to improve your FC is to drive when there's less traffic. Traffic is the biggest contributor to FC - the heavier the traffic, the lower the FC. I've gotten as low as 5 km/L and as high as 23 km/L with my Civic and it was all dependent on the traffic conditions at the time.
Also, just keep your car maintained according to the maintenance schedule indicated in your manual. No fancy add-ons will bring miraculous FC improvements. As long as your engine is in tip-top condition, you'll get the best FC possible with your Civic.
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