"...hundreds of thousands of Brazilians are skirting the high cost of gasoline by driving these new "flex-fuel" cars, which hit showroom floors late last year and have been selling fast ever since. Lured by the low price of ethanol, Brazilians bought almost 220,000 of these hybrid vehicles in the first nine months of the year, representing 24 percent of all new-car sales in the country."
Not exactly hydrogen, but an interesting case of path dependence in innovation adoption (ie, Brazil got locked into using this after the oil shocks of the 70s), as well as a basic illustration of how powerful energy economies are going to be in the next 25 years.