Quick and dirty math here, if any one sees flaws, point them out.
From here:
http://www.bts.gov/publications/national_transportation_statistics/html/table_04_06_m.html
Jet fuel = 37,626,700 joules/liter
10,000 gallons = 37,854.118 liters
So our energy comes out to 1424325541751 joules.
1 Kg of TNT = 4612070 joules
So I'm getting 10,000 gallons of jet fule being inline with 308825.6557 Kg of TNT.
However some things to factor in, TNT is a high explsove and would release its energy much faster then JP4. Also this takes into account total conversion and usage of the JP4 in a single blast. We all saw that the explosion was over a few seconds and was more of a rapid burn, more in line with gun-poweder then TNT.
I'm sure Huntsman can explain the explosives side better then I