Power adapter any lighter?

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one of reasons i'm considering mbp mba leap of faith lightness--my aging back:(. power adapter, must pack, pretty heavy itself. lower-powered 45 w mba adapter light 60/85 w mbp adapter? suspect 0 or few nano grams diff...

don't suppose magsafe situation has changed either, is, no lighter 3rd-party products...
 

looking in notes, based on research did in 2010, prior mbp purchase

weight of psu (without mains cable or plug)
309g 85w(mbp)
225g 65w
187g 45w(mba)
little plug goes mains weighs 30g

not quite sure there numbers came from, can confirm weight of 85w

so, 4 oz difference between 85w , 45w
 


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