It's actually a benefit to be 60kg! Carb g/hr tolerance is not related to body mass.
There are a couple of later steps where higher muscle mass might have an influence, but the biggest bottlenecks are much earlier in the GI tract and so size-independent (and trainable).
But to address the OP, I have not had a client able to manage over 100g, and getting up to 90 for a full IM is challenge enough typically. But to be fair, I have also not had a client (including myself) able/willing to commit to the nutritional training a nice high CHO rate requires.
http://www.extramilenutrition.com
There are a couple of later steps where higher muscle mass might have an influence, but the biggest bottlenecks are much earlier in the GI tract and so size-independent (and trainable).
But to address the OP, I have not had a client able to manage over 100g, and getting up to 90 for a full IM is challenge enough typically. But to be fair, I have also not had a client (including myself) able/willing to commit to the nutritional training a nice high CHO rate requires.
http://www.extramilenutrition.com