Consultants Recommendation MTBEThis could be what has been moving the price recently. Comments.
Link summary
https://www.methanex.com/investorcentre/MTBE.htm#cec
On February 19, 2002, the California Energy Commission (CEC) hosted a workshop on the possible impacts of an MTBE phase-out on gasoline supplies. At the workshop, consultants for the CEC advised that keeping the current phase-out date for MTBE of January 1, 2003, will cause a 5% to 10% gasoline supply shortfall, and pump price increases of 50% to 100%. The consultants recommended delaying the MTBE phase out to November 2005.
To view the entire presentation.
https://www.energy.ca.gov/mtbe/2002-02-19_STILLWATER_ASSOC.PPT