At the 14 November settle, fuel oil front-month closed at Y4,236/t, up 3.04% on the day - the sharpest move across the tracked complex. Bitumen settled at Y4,413/t, gaining a narrower 0.87%. The fuel oil-bitumen spread has flipped from a premium at the start of the month to a -Y177/t discount, the widest inversion this quarter.

The inversion changes the refinery residue equation. Cheaper fuel oil lowers the marginal cost of blending VLSFO marine fuel, while road-grade bitumen demand stays soft as northern construction enters its off-season. On a single atmospheric-vacuum unit, routing residue to bunker fuel versus asphalt can swing the per-tonne economics by more than Y100 within a week.

On the crude side, Brent at $96.366/bbl and WTI at $88.985/bbl put the transatlantic spread at $7.38/bbl, the widest in recent sessions. A deeper WTI discount sharpens the arbitrage for medium-sour grades - ESPO, Urals, Basrah Light - where delivered value holds up better, while the re-rating of light-sweet barrels actually compresses their own spread window.