Marathon Petroleum Corp. is in discussions with potential buyers of its sprawling Speedway gas-station unit, reviving a sale that fell apart in the early stages of the coronavirus crisis.

Possible buyers include Canada’s Alimentation Couche-Tard Inc., people familiar with the matter said. It couldn’t be determined how much the business might fetch, but Marathon indicated last fall that it could be worth between $15 billion and $18 billion.

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