• Kpler, Vortexa and Sparta Commodities tracking shows September US-to-Asia crude bookings topping 40 million barrels, versus an estimated 22 million in August, Rigzone reported Aug. 25, 2026.
• The Mars crude premium over WTI has narrowed to about $2.50 a barrel from $18 in early April — the main economic driver pulling barrels toward Asia, per Vortexa.
• Weekly US crude exports ran 4.01 million barrels a day for the week ending Aug. 14, still below the roughly 6.5 million barrels a day peak of late April.
• Kpler's Matt Smith expects much of the added Asian volume to come at Europe's expense rather than add to total US export volume, a different read than the headline pickup implies.
• EIA's most recent weekly survey (week ended Aug. 17, 2026) put US regular gasoline at $4.049 a gallon, up from $4.006 a week earlier; Rigzone separately characterized pump prices as at record highs without citing a figure.

Asian refiners are set to nearly double their US crude purchases for September loading. Kpler, Vortexa and Sparta Commodities estimate more than 40 million barrels booked, versus an estimated 22 million in August, Rigzone reported Aug. 25, 2026, citing the three tracking firms. The trigger is price: the Mars-WTI spread has narrowed to about $2.50 a barrel, near a three-month high, from an $18 premium in early April, cheapening US Gulf grades for Asian buyers. Rigzone frames the shift as a squeeze on domestic fuel makers already facing record pump prices, but the tracking figures are provisional, and one of the three analysts Rigzone cited says the added Asian volume may partly redirect barrels that would otherwise have gone to Europe rather than adding new total export volume. Analysis, not advice.

Why the Spread Narrowed

The trigger is price, not a shift in Asian demand. Mars, the US Gulf of Mexico sour benchmark, traded at about a $2.50-a-barrel premium to WTI as of Aug. 25, 2026 — near a three-month high — down from an $18 premium in early April, Vortexa senior oil market analyst Rohit Rathod told Rigzone. A narrower Mars-WTI spread makes US Gulf Coast barrels cheaper relative to competing grades for Asian refiners, which is the economic mechanism Rigzone's sourcing points to for the September pickup in bookings.

The Domestic Squeeze

More export demand competes with domestic refiners for the same Gulf Coast barrels at an already elevated moment for pump prices: Rigzone characterized US gasoline as at record highs, without citing a specific figure, and EIA's most recent weekly survey (week ended Aug. 17, 2026) put the US regular gasoline average at $4.049 a gallon, up from $4.006 a week earlier. On the crude side, Sparta Commodities analyst Nikolas Plonski told Rigzone that Mars "will be at the epicenter of this tightness" for US refiners, and Rathod said the pickup in exports could mean tighter sour crude availability for refiners running at high rates. Kpler director of commodity research Matt Smith offered a different read, saying the added Asian volume will likely come largely at the expense of flows to Europe rather than adding new barrels to total US exports — meaning the domestic supply hit may be smaller than the headline export figure implies. This is analysis of tracked flows, not a trading call.

What to Watch

Two things could move the picture before September cargoes finish loading. First, the Kpler, Vortexa and Sparta figures are provisional ship-tracking estimates, not final EIA or customs export data, and typically get revised. Second, weekly US crude exports were running 4.01 million barrels a day for the week ending Aug. 14 — below the roughly 6.5 million barrels a day peak in late April — so the September total will hinge on whether the narrower Mars-WTI spread holds through month-end, and on whether Smith's Europe-diversion read or the tighter-sour-supply read from Rathod and Plonski proves closer to what actually loads.