The most immediate threat to Marathon Petroleum's margin and market position is the structural compression of refining margins from the record levels of 2022, which has reduced earnings despite stable throughput volumes. The company's Refining & Marketing segment adjusted EBITDA collapsed from $19.3 billion in 2022 to $13.7 billion in 2023 to $5.7 billion in 2024—a 70.5% decline over two years—while total revenues and other income fell from $177.5 billion in 2022 to $135.2 billion in 2025. Net income attributable to MPC declined from $14.5 billion in 2022 to $4.0 billion in 2025, a 72.1% drop. This margin compression reflects the normalization of crack spreads as global refining capacity recovered from pandemic-related shutdowns and as demand growth moderated. The US Gulf Coast, Chicago, and West Coast blended 3-2-1 crack spread, which exceeded $30 per barrel at times in 2022, has normalized to much lower levels, directly impacting profitability per barrel processed. Marathon Petroleum's heavy dependence on refining—its core revenue and earnings driver—makes it more vulnerable to margin volatility than integrated oil companies with upstream production to offset downstream weakness. The company's debt load, with total debt of $28.7 billion and a debt-to-equity ratio of 103.48%, creates financial leverage that amplifies both upside and downside. While the company maintains an investment-grade credit rating, the high leverage limits flexibility during prolonged margin downturns. The Renewable Fuel Standard (RFS) program creates ongoing compliance costs and regulatory uncertainty. Marathon Petroleum must purchase Renewable Identification Numbers (RINs) to comply with biofuel blending mandates, and RIN prices have been volatile. The company received a Small Refinery Exemption (SRE) credit of $57 million in 2025, but the political and legal status of SREs remains uncertain. The energy transition poses a long-term structural challenge: as electric vehicle adoption increases and renewable energy displaces fossil fuels, demand for gasoline and diesel is projected to peak and decline, reducing the addressable market for Marathon Petroleum's core refining business. The company is investing in renewable fuels as a hedge, but the renewable diesel segment generated negative adjusted EBITDA of $150 million in 2024 and remains a small fraction of total earnings. The 2020 sale of the Speedway retail business to 7-Eleven for $21 billion removed a stable, non-cyclical earnings stream and converted it into a one-time cash inflow that was used to reduce debt. While the divestiture improved the balance sheet, it also reduced the company's vertical integration and exposure to retail fuel margins. Competition in the US refining industry is intense, with Valero Energy, Phillips 66, PBF Energy, and HF Sinclair all operating large, complex refineries and competing for the same crude supplies and product markets. The US refining industry is structurally advantaged due to low-cost domestic energy, but this advantage is shared by all competitors, not unique to Marathon Petroleum. Regulatory risks include potential carbon pricing, stricter emissions standards, and evolving biofuel mandates that could increase compliance costs. The company's 16 refineries are subject to environmental regulations, safety requirements, and potential liability from incidents such as the 2021 Garyville refinery event. Turnaround costs—scheduled maintenance shutdowns—are significant and recurring, with $1.55 billion in planned turnaround costs for Refining and Renewable Diesel in 2024.