Apparently GasBuddy's internal API is wide open for use and you can grab gasoline pricing data per zipcode. Might be a fun project to iterate over all US zipcodes and start saving the data on a daily basis.
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You can get even more detailed info (by gas station) using this call:
gasbuddy.com/assets-v2/api/
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.... if gas prices predict violence .... we can coin it as the the staw that broke the camels back phenomenon lol.