It has been 30 years since I has anything to do with the POL industry. As I remember, there are six geographical regions for gasoline formulations and two different blends per region. There are also local blending sites (usually at pipeline terminals) that have blending permits, so winter formulations have more volatility (higher Reid vapor pressure) than summer blends and higher elevations have lower volatility than lower elevations. Then there is the West Coast where everything is blended to suit California's mandates, and not to the national agreements between the major refineries. For instance, when we lived in Murray, KY our gasoline terminal was in Cottage Grove, TN. Until 2016 Cottage Grove did not have a blending permit for ethanol, so all the gasoline sold in the region was ethanol free event though the gas pumps said gasoline may contain 10% ethanol.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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