You will note from my earlier post where I introduced the hydrogen topic that I said for ground based transport. This is because the extra weight compared to petrol etc. doesn't matter too much.
Hydrocarbon fuels have a very good specific energy density - ie energy available for weight. Much better than current battery technology and hydrogen (glad to see that PDR1 has done a bit of research now). That's one reason why they are going to be so hard to replace in aircraft.