EIA: growing octane needs widen price difference between regular and premium in US
Green Car Congress
JUNE 22, 2017
gallon in late 2016 and it has remained near that level so far in 2017. This price difference, or spread, has been generally increasing since 2000. EIA suggested that the upward trend in premium gasoline sales is likely driven by changes in fuel requirements for light-duty vehicles in response to increasing fuel economy standards.
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