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So this quote "...All of the energy concentrated in one gallon of gasoline is enough to charge an iPhone once a day for almost 20 years...." got me thinking; why in the heck don't we have a micro-sized bio-diesel engine in our cell phones?  

It might sound crazy, but the energy density in bio-diesel surpasses that of gasoline, bio-diesel is not toxic, it is not flammable (it is combustible, but there's a difference - look it up if you don't know), produces low emissions, and it's easily produced.

Conservatively, an ounce of fuel would provide enough energy for more than a  weeks worth of smartphone use.  One oz is about 300 watt/hrs of energy, and the average smart phone uses about 1 watt at full throttle and only a few milliwatts the majority of the time; I'm assuming 136k btu/gal energy density.  

In a time where we are building nano-machines, a micro engine like this seems like it could be feasible.  Who's smart enough to kickstarter this?  
ExxonMobil's Perspectives blog offers views on issues, policies, technologies and trends that are shaping the energy industry
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