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How are my gas appliances working?

I am considering adding an outdoor gas fire pit so I've started to read up on what it would take to make this happen. I have many gas consuming appliances in my home so I was hoping my supply would be adequate. Heading into the basement I was surprised to see a 3/4" gas pipe entering from the service. The typical sizing chart I've seen online tells me that there's no way this should work:

Service---- 20'-----Gas Range -------10'-----Gas insert-----15'-----2xFurnaces------8'----Dryer---5'----2xHWTs

Range: 8k BTU
Fireplace: 37K BTU
Furnace 1: 66K BTU
Furnace 2: 66K BTU
Dryer: 20K BTU
HWT1: 40K BTU
HWT2: 40K BTU


Total: 277K BTU

I have a '400K BTU' meter. The home was built in 2008 by a reputable builder so I'm assuming I am missing something here as the chart I'm finding online tells me that 3/4" supply couldn't keep half of these devices working at these runs. We bought the home in 2012 so we've been happily using (a lot of) gas since then and I'm certain I've had all of these gas consumers firing at the same time.

That said, how can I find out the true capacity of that gas pipe run? If it is possible to split off to a firepit, the T would go between the furnaces and the dryer. If not, what are my options? Replacing the 3/4" trunk with something larger would be a pretty big ordeal. My gas supplier said an upgrade to a 600K meter is easy and cheap (~ $100) ... if I were to do this, could I run another 3/4" in parallel to the current one, and allow that to feed the fire pit? I would like to add an outdoor kitchen at some point so would need that extra capacity down the road.

Thanks for any answers - really scratching my head over here.

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