According to this Los Angeles Times article, while gas prices continue to rise in the United States,

"Today about 40 percent of all the fuel that Brazilians pump into their vehicles is ethanol, known here as alcohol, compared with about 3 percent in the United States. No other nation is using ethanol on such a vast scale. The change wasn't easy or cheap. But 30 years later, Brazil is reaping the return on its investment in energy security while the United States writes checks for $50-a-barrel foreign oil."