Gasoline has an energy density of about 45 megajoules per kilogram (MJ/kg)
Coal has energy content of 15 to 19 KJ/gram
lpg is 24.9mj per litre
diesel is a little higher than petrol in energy density
pure ethanol is about 26.8 mj/kg
heres some more
File:Energy density.svg - Wikipedia, the free encyclopedia
The 'repackaged' hydrogen has specific energy density of 14MJ/Kg,
14mj/kg os pbviously very low, your better off running pure ethanol or anything but that.
p.s i quickly googled these numbers so correct me if i am wrong or not factoring in something.