BUZZ-Parkland Fuel Corp: Co to buy Pioneer Energy
** Shares of Canada's largest fuel distributor and retailer up 8.2 pct at C$21.54
** Company said Wednesday it would buy fuel retailer Pioneer Energy, part-owned by Suncor Energy Inc, for C$378 million
** stock headed for biggest single-day gain in three years
** Up to Wednesday's close, Parkland's shares had risen 13 pct in past year
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