unbolt it and leave it behind?
yes a wind deflector will help somewhat, but you've already overloaded the roof limit by the time you put the 3 full jerries and the rack on.
to get the drag down you need to take care of the leading and trailing edges, keep it low and keep all the items together, foam packing the space between the roof and the rack at the edges and if its a rack made of arc mesh lining it with shade cloth and zip tying it down will help
Taper the tail edge of the load as best you can. if you cover it with a tarp, package it out with cloths and bedding and the like to stop the tarp from flapping.


 
					
					 
				
				
				
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