# Disregarding negative externalities and other barriers, what are some fuels that have a higher power density than gasoline?

Gasoline’s power throughput per kg is $12\,200\:\mathrm{Wh/kg}$ (Wikipedia.org). Are there any other fuels that have a higher power output that are not considered viable solutions as they are difficult to handle or have negative externalities?

Also what characteristics of their molecular structure give them the high energy throughput?

• A table of energy released per mass of fuel (not counting other masses such as oxidizer) can be found in the energy density article on Wikipedia. Also of interest is that Wikipedia states (without citation) that the chemical reaction which produces most energy per total mass of reactants (fuel+oxidizer) is the combustion of beryllium metal, producing beryllium oxide. – Nicolau Saker Neto Jun 12 '15 at 15:35
• This might be moved to an Answer. – DrMoishe Pippik Jan 10 '17 at 3:12