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Don't bother.
I have a 1.6 petrol Renault.
I tow a 600kg enclosed trailer with it, usually at least once a week.
My best tank without trailer is 6.0l/100km. My worst trip with the trailer is 10.0l/100km.
That equates to 0.00666/100km per kg.
This is worst case scenario stuff. 100% city use (10-15mph average speeds), there's an extra axle and extra aero drag.
Do the easy and big stuff by all means, but I wouldn't go crazy. Carpets and sound deadening are a step too far IMO.
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