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I suspect that the weight of the trailer will make a huge difference. The added rolling resistance (in the most general sense, including loss due to tire deformation) and the losses in acceleration (much more power needed to get going) is probably more important than the additional drag (if you're at reasonable speeds).

Also, an 'advantage' of the R1 is that its cross sectional area is quite large, so it hides more of the trailer compared to a MY.

Bottom line is that I would expect less than 50% range reduction if the trailer isn't super heavy (like that 9000 lbs beast that was mentioned) or bulky.
 

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Yeah I hear you about drag, but weight is a huge factor and in the absence of actual numbers for your specific setup it's probably useless to speculate. I just think that a modest setup at modest (highway) speeds will not set you back 50%.
 
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