Not that I can see, but I'm particularly blind to my own typos.

To paraphrase, in the event it's just a clarity problem:

6.5% of a ton of natural gas aka methane is 65 kg. It has a global warming potential 100 times that of carbon dioxide over 10 years. 100 times 65 kg is 6,500 kg, i.e 6.5 metric tons.

It has a GWP of 86x CO2 at 20 years, so 6 metric tons CO2 or equivalent.

It has a GWP of 29x CO2 over 100 years, so 1.9 metric tons CO2e.

Does that help?