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Ammonia is said to offer a higher energy content per kilogram than petrol...
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Somebody is taking the piss. Ammonia(5.8kwh/kg) has half the energy content per kilogram of Gasoline(11.8 kWh/kg) and almost half the energy content per gallon.
Page 11, Onboard Storage of Anhydrous Ammonia
http://www.hydrogen.energy.gov/pdfs/nh3_paper.pdf
Gasoline energy density, you can find on the wiki page.