Unusual moves in an oil-market gauge are prompting Vanguard Asset Management to buy insurance against stickier-than-expected U.S. inflation. Gasoline prices have fallen, but they’ve failed to match the sharp slump in crude since the fragile U.S.-Iran ceasefire, sending the gap between the two – known as the crack spread – to its highest level since 2022. YourDailyAnalysis flags the metric itself as the story here: crack spreads are a fairly routine tool in oil trading but a rarely-watched one for bond investors, which makes Vanguard’s decision to build a position around it notable regardless of what the trade ultimately returns.
Ales Koutny, head of international rates at Vanguard’s active funds, made the unusual nature of this focus explicit. “We have never followed this so closely,” Koutny said. “Because of the high correlation to oil prices, crack spreads are normally an afterthought, but prices for gasoline, jet fuel, diesel and fuel oil are all behaving very differently to oil prices.” The mechanism behind that divergence is specific and traceable: the Iran war has sharply cut how much fuel the world’s oil refineries are producing, while a wave of Ukrainian attacks on Russian refining plants has prompted Moscow to ban diesel exports, pushing up its own refining margins.
The bet Koutny is making rests on a question about persistence rather than direction. “The question is whether the spread will normalize, or will the low correlation become a more structural feature which could impact inflation risks,” he said. “These deviations could affect both sides of the argument, and this could be quite significant.” YourDailyAnalysis reads that framing as genuinely two-sided rather than a directional inflation call: Koutny isn’t claiming certainty that inflation will run hot, he’s arguing the market is mispricing the range of outcomes by not paying attention to this specific signal at all.
The market-pricing gap Vanguard is positioning against is concrete and measurable. Two-year breakeven levels for U.S. Treasuries – which track the difference between nominal and inflation-protected yields – have tumbled over the past month to near their lowest levels in nearly two years, implying markets see inflation running only slightly above the Fed’s 2% target two years out. That has prompted Koutny’s team to open a long position in short-dated inflation-protected Treasuries as well as longer-dated breakevens, betting markets are underpricing the odds inflation lingers longer than current pricing implies.
The timing of this positioning intersects directly with this week’s broader escalation. A flare-up in hostilities after President Trump cast doubt on the U.S. ceasefire with Iran sent oil prices surging again this week, which reinforces rather than undermines the thesis behind Vanguard’s trade – renewed conflict volatility is precisely the kind of event that could widen the crack-spread anomaly further rather than let it normalize on its own. Your Daily Analysis notes that Vanguard built this position before the latest escalation, which means this week’s renewed strikes function as an early, real-time test of the thesis rather than the trigger for it.
Vanguard’s team is also working to formalize this signal into its broader process, rather than treating it as a one-off trade. The team is in the process of fine-tuning their inflation models to include different oil distillates, in addition to crude, as a proxy for inflation risk – meaning this specific crack-spread anomaly may become a standing input in how Vanguard forecasts inflation going forward, not just a tactical position tied to the current Iran conflict.
Watch two-year breakeven levels for whether they start pricing in more of the inflation risk Koutny is flagging, and watch whether traders’ current bets – for one 25 basis point hike each from the Fed, the European Central Bank and the Bank of England by year-end – shift further as crack spreads either normalize or stay elevated. YourDailyAnalysis views the crack spread’s behavior over the coming weeks as a genuinely useful real-time indicator for the broader inflation debate, precisely because, as Koutny noted, almost no one else in fixed income is currently watching it this closely.
