I can't remember where I read it. But the article talks about how car companies are trying to make lighter cars, but it get's cancelled out because americans are getting fatter. we are nation of fatties
Also, not too keen on magnesium. They burn hot as hell. Their burning temp is off the chart. I'm sure the GM knows properties of magnesium.
Hopefully, it will turn out well. If not, there will be crap load of people ready to sue.