I obviously bow to Mr Pages superior bomb knowledge....

But, aren't you assuming that the garage is more hydrogen-tight than the fuel tank of the beemer?

Wouldn't it just dissipate quite rapidly?

Exposure to hydrogen can weaken many metals.

http://en.wikipedia.org/wiki/Hydrogen_damage

You beat me to it.

I was wondering about Mr Page's garage - whether it was actually some sort of Trekkie electromagnetic containment bottle or some such, because I'm dead certain any hydrogen that escapes from a fuel tank in my garage would be in the stratosphere in minutes.

My garage is a wooden framed thing with painted steel panels on the sides and a corrugated steel roof afixed to the frame with nails. Anything capable of squeezing out of a thick walled pressure cylinder would (as Pratchett said) "go through it like kzak fruit through a short grandmother."

The average garage is barely waterproof, let alone hydrogen-proof.

Is BMW now a terrorist organization trying to get us to drive around in our own personal thermobaric bombs? How German of them!

The precious metals mkt says platinum is going for $1440 a troy ounce. At 31 grams per troy ounce that's more like $46 a gram.

The math(s) seems reasonable to me.

The auto manufacturers, that is, if they were serious about "greenness" and preserving fossil fuels, they'd be focusing on electric cars and leave how to convert fuel into energy up to different market segments.

As if their Insight, Hybrid Camry, Hybrid Civic weren't enough of an embarrassment, now Honda thinks mobile hydrogen is the path. Even Ford was smart enough to adopt Toyota's Hybrid Synergy Drive method for Escape rather than Honda's or even the half-assed boondoggle that GM is adopting. Instead of 10 years ahead, Toyota will be 15 years ahead. All they have to do is drop a diesel and advanced lithium, or perhaps a rechargeable ZnAir / AlAir if it materializes, and they're good for another 10 yrs; or more.

You have energy-dense biodiesel with competing sponsorships from McDonalds, Burger King, etc for the title of the best french fry smelling exhaust!!!!