Guys if you notice, Tiago and Indica have exactly same wheelbase. Same I noticed with Tigor and Indigo CS. So Tamo claiming they increased wheelbase of Tiago to make Tigor may be just for marketing. In reality they are both derived from earlier Indica siblings.
I am getting a feeling both Tiago and Tigor are using same underpinning as Indica / CS..just with different body shell and engine with one less cylinder.