Exhibit 99.1 Murphy USA Inc. Reports Preliminary First Quarter 2024 Results El Dorado, Arkansas, May 1, 2024 (BUSINESS WIRE) – Murphy USA Inc. (NYSE: MUSA), a leading marketer of retail motor fuel products and convenience merchandise, today announced financial results for the three months ended March 31, 2024. Key Highlights: • Net income was $66.0 million, or $3.12 per diluted share, in Q1 2024 compared to net income of $106.3 million, or $4.80 per diluted share, in Q1 2023. • Total fuel contribution for Q ...