[gwhiogia] Pouring gasoline into your cell phone every night

How much gasoline would it take to charge up a 10 watt hour smartphone battery?  We'll calculate using the units program:

You have: (10 watt hour / (44 mega joule / kilogram)) / (748.9 kilogram / m^3)
You want: ml
* 1.0925114

You want: teaspoon
* 0.22165324

(assuming 100% efficiency)

One can see the allure of fuel cells.