The R1 motors are notorious for having porous crankcases therfore oil usage is high or can be. Yamaha will inform you that this is within there tolerances.
This is becoming a problem with nearly all motor manufactures as they make there crankcases thinner for cost and weight saving.
I always carry about 250ml if i'm going on a long journey as theres nowt worse than the red light coming on when your flooring it.
Hope this helps