uhm http://en.wikipedia.org/wiki/Energy_density#Energy_density_in_energy_storage_and_in_fuel

Hydrogen (compressed at 700 bar) 123Mj/kg
Jet fuel 43Mj/kg

How about something like this?
http://www.amazon.com/Lorex-LW2031-connect-Wireless-Monitor/dp/B005GTNZU2

Sarge: May I introduce, our new Light-Reconnaissance vehicle. (Rotating around the new jeep) It has 4-inch Armor Plating; M.A.G. Bumper Suspension; a mounted machine gunner position, and total seating for three. Gentlemen! This is the M12 LRV! I like to call it the 'Warthog'.
        Simmons: Why 'Warthog,' Sir?
        Sarge: Because 'M12 LRV' is too hard to say in conversation, son.
        Grif: No, but, why 'Warthog'? I mean, it doesn't really look like a pig...
        Sarge: Say that again?
        Grif: I think it looks more like a Puma.
        Sarge: What in Sam Hell is a 'Puma'?
        Simmons: Uhh, you mean like the shoe company?
        Grif: No, like a Puma. It's a big cat, like a lion.
        Sarge: You're making that up.
        Grif: I'm telling you, it's a real animal!
        Sarge: Simmons, I want you to poison Grif's next meal.
        Simmons: Yes sir!