Since a 36" has the heaviest parts, it has the biggest potential for savings.
Sask has drilled out his Coker rim and reported the weight savings at ~75g: Coker Rim - #44 by saskatchewanian
Switching from a regular 36" tube to a 29" tube (or a 36" FOSS tube) will save ~12oz. (I’ve never run a 36" tube; I built my 36" with a 29x2.3 tube that weighs 7.3oz)
My Nightrider tire weights 4lbs 10oz. Switching to a 1000g tire would save almost 2.5lbs (~39oz): 900-1000g 36" tire, anyone interested?
Needless to say, a lot of people are anxiously waiting for that tire to become a reality.