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Yeah, we can safely carry four bikes, alternating backwards and forwards, but energy usage doubles at 73 mph.
Not a direct comparison, but with three bikes on WB201 racks plus one empty WB201, my range decreases by nearly 50% @73 mph: 600 Wh/mile!
Sad to hear rumors of Whispbar's demise! Presumably Yakima's killing them off in favor of their own StreamLine System with suspiciousy-similar...