Presuming this is your large estate, remove wheels, stuff the lot in the back with one rear seat dropped, put rider of the size M in a roof box, save ~8.37 mpg.
http://aerodyneuk.com/truck-aerodynamics/
@ColinTheBald started
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Presuming this is your large estate, remove wheels, stuff the lot in the back with one rear seat dropped, put rider of the size M in a roof box, save ~8.37 mpg.