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Sinclair Launches Mammoth Monday, With Fuel Savings of up to 25 Cents Per Gallon

Sinclair Oil (Sinclair), an HF Sinclair (NYSE: DINO) brand, announced today the national launch of Mammoth Monday™, a new weekly fuel savings event designed to reward loyal customers with one of Sinclair’s biggest fuel discounts of the week. Beginning Monday, Aug. 3, 2026, eligible DINOPAY® users c…

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