Why has the mid-Atlantic and NE US seen higher #gasprices and diesel this year? Primarily, because its lack of refiners in the region. The US is sliced into various markets, all with slightly different supply and demand. 
Big difference right now between PA and OH- big reason is PA is in a tight market, OH is not. In fact, while state gas taxes vary, this map is the key to why some neighboring states can be higher or lower than each other.
Supply in the Chicago market could be impacted by a refinery outage at a facility in Indiana, but that would be isolated to the states that make up the Chicago market, whereas refinery problems in California would affect the states that make up the West market.
Typically, the Gulf, with many major refiners, doesn't see spikes due to unexpected downtime because there are many refineries that can offset one or two facilities going down. That's not true in the West, where they also rely on imported product to make ends meet.
Every region is a bit different, some are chronically short or tight. A refinery goes down, or two, or three, can make a huge difference and prices react as a result.
The states tied to "NY Harbor" have seen prices elevated this year because it is competing with other areas/countries for supply. It must bring in product to make ends meet. That has led to higher prices this year because acute supply challenges.
This is also why areas like Utah, Montana, Nevada, etc saw prices skyrocket in October with various unexpected shutdowns at refineries in California.
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