[ska]

I suspect this problem is really dependent by city or even neighborhood. I think the real practical limit is the municipal supply design rather than the available units.

A friend had a 5 burner unit in their house that visibly dropped output if you ran 4 or 5 at the same time, just not enough gas coming into the house. By comparison the commercial kitchen on the same block was happily running a flat top an 2 other stations at full blast; so it can't have fundamentally been supply just the way it was distributed.