Newsom's office cited an analysis that found that Chevron averaged more than 60 to 80 cents per gallon above unbranded alternatives.
The company has been the largest employer and source of tax revenue in the city for years, but has received scrutiny for the pollution it causes.
Chevron announced that over the next five years, it will migrate its headquarters and all corporate functions out of the Bay Area from San Ramon to Houston, Texas. Here's why some say it's not surprising.
Chevron says if voters approve the "Polluters Pay Initiative" ballot measure in November, drivers across the Bay Area can expect to pay more at the pump.
While some day the tax would just be a way to make Chevron pay for damage its done to the community, others say it could have unintended consequences.
The city of Richmond altered the public Saturday at 1:51 p.m. "of a CWS Level 1 incident due to visible flaring" at the Chevron refinery.