Petro-Canada shareholders have voted to approve the takeover of their integrated oil and gas company by Suncor Energy Inc., uniting two of Canada's biggest oil companies, according to AP. Shareholders voted about 96 percent in favor Thursday of the CA$19 billion deal ($17 billion) with Suncor. The two Calgary-based firms announced their plans to merge in March, saying the transaction would create an energy heavyweight with a stock market value of CA$46 billion ($41 billion). Suncor shareholders are to vote later Thursday. Petro-Canada and Suncor also must get approval from Canadian regulators to carry out the merger.