The White House is considering waiving U.S. gasoline environmental rules aimed at reducing summertime smog, hoping the waiver will combat rising pump prices, according to three sources involved in the discussions. Refiners and blenders are required to avoid lower-cost components like butane in summer gasoline, but the White House is weighing suspending that rule to help lower fuel costs. The components help elevate gasoline’s Reid vapor pressure, or RVP, which contributes to smog at higher levels, particularly in the hot summer months. President Joe Biden’s administration has already lifted the requirement for summer sales of E15, a lower-price, high ethanol gasoline. The waiver under consideration would apply to all grades of gasoline, the sources said. No final decision has been made, they said. The White House did not immediately respond to request for comment. Outside groups, particularly governors, have been lobbying the White House to […]