Kgs to Litres, depends on SG, but I think it is c1.25 to 1.35, ie. multiply your "kgs" by c1.3 to give litres. 1 gallon = 4.54 litres if you want to do the gallon thing.
I think jet fuel is c$200 per tonne (1000 kg) but I could be wrong....it has been known
