Here in SoCal at my local corner gas stations. the price is $5.95 a gallon for regular. Last week I paid $4.86 at Costco. It has gone up around 50 cents per gallon in the last few weeks.
https://www.forbes.com/advisor/personal-finance/gas-prices-by-state-9-21-22/
Graph of every state right here. California, as always, is highest in the nation.
Your recent increase is the extra cost of winter blend hitting the market.