Comment by m463

It's too bad about nuclear power.

From wikipedia energy density:

  Coal, anthracite... 26–33 MJ/kg
  Natural gas........ 53.6 MJ/kg
  Diesel fuel........ 45.6 MJ/kg

  Plutonium-239...... 83,610,000 MJ/kg

also: :)

  Antimatter......... 89,875,517,874 MJ/kg

https://en.wikipedia.org/wiki/Energy_density

or:

In light-water reactors, 1 kg of natural uranium - following a corresponding enrichment and used for power generation - is equivalent to the energy content of nearly 10,000 kg of mineral oil or 14,000 kg of coal.

https://en.wikipedia.org/wiki/Energy_density#Fission_reactor...