by Guest » Mon Jan 21, 2008 7:15 pm
Sure, just multiply by the energy content in PJ/L. Per US DoE,
Propane is 50.235 MJ/kg, 25.48 MJ/L.
Butane is 49.210 MJ/kg, 28.769 MJ/L.
(both values HHV)
Most liquid hydrocarbons are "about the same" on a weight basis (slightly higher if they have higher hydrogen content), but vary on a volumetric basis according to density.