i'm not super keen on this sort of thing, but if you are trying to save total edges and make things look as good as possible, wouldn't just adding more edgeloops along the long side of the cylinder be best? Then you dont see the unrealistic faceting which gives away the low poly, and you don't need so many triangles just…
@Raphael_Bouch You're thinking of this the wrong way around. The ingame lowpoly is not supposed to be a passive result, dictated by whatever was done to create the high. The ingame lowpoly *is* the model that requires 100% control and proactive care on how it is built - because that is the one that gets in the game. And…