Argus recently launched a calculated assessment for reformulated gasoline in Group Three. This move comes following recent changes that were made in gasoline specifications for the Denver, Colorado, area in 2024.
Summertime conventional gasoline sales in Denver, Colorado ended on 7 November 2023 when the US Environmental Protection Agency (EPA) mandated reformulated gasoline for the metropolitan area during the summer season. The shift in specifications was first announced by the EPA ruling in November 2022 when it found the region was not meeting federal ozone standards. Reformulated gasoline burns cleaner than its conventional counterpart but is also a more expensive fuel to produce.
For the winter months, Denver gasoline prices will likely change little from years past. The Reid Vapor Pressure (RVP) levels for reformulated gasoline will likely closely mimic those seen in Group Three’s conventional gasoline market for the southern portion of the midcontinent.
But come summer – which is defined as 1 June through 15 September – Denver area retailers will be required to sell 7.4 RVP reformulated gasoline, as opposed to a prior requirement of 7.8 RVP conventional fuel. This is expected to widen Denver's premium to conventional prices in nearby regions.
Denver reformulated gasoline's premium to sub-octane gasoline prices in adjacent states such as Oklahoma and Kansas should be similar to spreads between Gulf coast CBOB and Gulf coast RBOB. Denver's reformulated gasoline supply will come from a combination of shipments from the midcontinent and Gulf coast markets, as well as from Suncor's 103,000 b/d refinery in nearby Commerce City, Colorado.
Group Three RBOB Methodology
Prices for Regular RBOB are published year-round for 10,000 bl on a fob Tulsa, Oklahoma basis.
Prices are calculated by applying the spread between the prompt Argus Regular Texas Destination RBOB and Regular Colonial CBOB from the US Gulf coast markets to the respective prompt Magellan suboctane V grade price. The use of the spread value mitigates the end-of-summer shift in Colonial RVP specifications.
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Author: Paul Dahlgren, Editor, Refined Products Americas – Gasoline Markets
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Japan's refinery run rates rise in May despite Iran war
Japan's refinery run rates rise in May despite Iran war
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Iran warns new US-Israeli strikes will broaden war
Iran warns new US-Israeli strikes will broaden war
Dubai, 20 May (Argus) — Iran's Islamic Revolutionary Guard Corps (IRGC) warned on Wednesday that any renewed US or Israeli strikes on the country would lead to a broadening of the war beyond the Mideast Gulf region. "If the aggression against Iran is repeated, the regional war that was promised will extend beyond the region this time, and our crushing blows will land you… in places you cannot imagine," the IRGC said. The threat comes in response to incendiary rhetoric aimed at Iran's leadership, even as diplomacy has been taking place since a ceasefire was agreed in early April. US president Donald Trump said on Monday that "serious negotiations are now taking place" but warned Tehran, again, that "the clock is ticking" and that Iran had "better get moving, FAST, or there won't be anything left of them." Trump also said he was ready to carry out a new attack on Iran on Tuesday, but decided to postpone it after an intervention from the leaders of Qatar, Saudi Arabia and the UAE. Around six weeks of intense US and Israeli bombing targeting key officials, facilities and infrastructure linked to Iran's leadership, military and energy caused significant damage, but largely failed to weaken the regime's grip on power. The strikes also prompted Tehran and the Iranian armed forces to effectively close the strait of Hormuz, which has dramatically disrupted the movement of commercial vessels through the key waterway ꟷ including crude, oil products and LNG tankers. This in turn forced several Mideast Gulf countries that depended heavily on the strait to export oil and LNG to shut-in meaningful amounts of production, putting upward pressure on commodity prices. Front-month Ice Brent futures are hovering above $110/bl, more than 50pc up from before the US and Israel launched their initial salvo on Iran on 28 February. These new threats show Washington and Tel Aviv "have not learned from the major and strategic defeats" of the past few weeks, the IRGC said, warning that Iranian retaliation for any new strikes would be more widespread and more intense. While the US and Israel "attacked us with all their capabilities [in the initial phase of the war]… we did not use all of our capabilities," the IRGC said. Trump said on Tuesday he had put off a "major attack for a little while… hopefully forever," after the Mideast Gulf leaders told him they felt "they are very close to making a deal [with Iran]." "If we can do that where there is no nuclear weapon going into the hands of Iran, and if [the Mideast Gulf countries] are satisfied, we will probably be satisfied also," Trump said. Iranian state broadcaster IRIB said on Wednesday that Pakistan's interior minister had arrived in Tehran for talks with unnamed Iranian officials. Pakistan has been acting as the primary mediator between Iran and the US, and hosted a first round of talks between the sides in Islamabad in April. By Nader Itayim Send comments and request more information at feedback@argusmedia.com Copyright © 2026. Argus Media group . All rights reserved.
Norway to debate increasing diesel, jet stocks
Norway to debate increasing diesel, jet stocks
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Indonesia to route key commodity exports via state firm
Indonesia to route key commodity exports via state firm
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