GCGOH

I just bought a 2005 subaru impreza 1.6TS manual transmission. I was wondering is there is anything I can do to modify it for better fuel comsumption. Like my friend who drove a nissan, he has change the sparks plugs to better ones, add grounding cables, magnets, etc and the mileage of his car improve greatly. Is there any thing like this that can be done to subaru?