First of all, I think Warren Buffett's investment in PetroChina (PTR) was probably one of the most impressive bets he has ever made. Before China or energy were hot commodities he found a company that was emblematic of both and turned a $488 million investment into $4 billion, an astounding 700%+ return in five years. I'm not sure where that ranks among his all-time best investments (Buffett experts, please let us know), but it is surely his best in recent memory.

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