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I used to tow a 600kg enclosed trailer, 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 0.00666l/100km per kg. So best case for a NA engine you might loose 0.2L/100km per hundred pounds.
This is worst case scenario stuff. 100% city use (10-15mph average speeds), there's an extra axle and extra aero drag.
If you use the ecomodder calculator, add in trailer aerodrag and rolling res and it seems weight makes zero difference to a hypermiler's economy.
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