[kevkrom]

There was a similar article on this yesterday... I find it an interesting concept. Here's what I see as the advantages/disadvantages:

Pro

• No polluting emissions
• Reasonably cost-effective compared to current fuel prices
• Natural material source (aluminum) is highly abundant in the US; no foreign dependence

Con

• Weight -- roughly 150 lbs for a full "tank" means less efficient use of energy (more mass to move) and difficulties in exchanging out a "spent" tank for a "fresh" one
• Can we get political muscle behind the power sources (nuclear, etc.) to "recharge" the aluminum?

[bvw]

I would hope that the alumina and alloy may be able to reconstituted in a reversing mechanism run by electricity.

[ZULU]

What about the availability of Gallium?

I really only recall hearing about it in Chemistry class.

[RicocheT]

Add one more big CON,

It takes a tremendous amount of electric energy to refine aluminum oxide back into pure aluminum. There is no free lunch in this save energy deal.