We consider mixed integer linear sets defined by two equations involving two integer variables and any
number of non-negative continuous variables.We analyze the benefit from adding a non-split inequality
on top of the split closure. Applying a probabilisticmodel,we showthat the importance of a type 2 triangle
inequality decreases with decreasing lattice width, on average. Our results suggest that this is also true
for type 3 triangle and quadrilateral inequalities.