CNG:
FWIW I have an 1-1\4" line running from the meter to approx 33' across the basement with one elbow and 16' of 3\4" line from there to the farthest appliance.
I rounded up to 50' and at an 1-1\4" line, according to the chart, I have approx 588 total CFH available.
Total appliance load is...