Sinclair Launches Weekly Fuel Discount Program Aimed at Driving Customer Loyalty — HF Sinclair Corporation

Event summary

Sinclair Oil, a brand of HF Sinclair Corporation (NYSE: DINO), launched Mammoth Monday™ on August 3, 2026, offering weekly fuel discounts of up to 25 cents per gallon.
The discount is available exclusively through the DINOPAY mobile app for eligible users, with enhanced savings for those using Mobile Advantage™.
Mammoth Monday aims to incentivize customers to make Sinclair their primary fueling destination and increase DINOPAY app usage.

The big picture

Sinclair’s Mammoth Monday initiative reflects a broader industry trend of fuel retailers leveraging digital tools and loyalty programs to differentiate themselves in a competitive market. The program is part of HF Sinclair’s strategy to strengthen customer engagement and drive revenue growth through its branded stations, particularly as the company expands its renewable diesel production and refinery operations.

What we're watching

Customer Retention: Whether the weekly discount program will successfully drive repeat business and increase Sinclair’s market share in key regions.
Digital Adoption: The pace at which customers adopt the DINOPAY app and link eligible payment methods to access enhanced savings.
Competitive Response: How rival fuel retailers may react with their own loyalty programs or digital initiatives to counter Sinclair’s move.