Nation Donald Trump, California Gov. Gavin Newsom fight again on Twitter, this time over gas prices and electric cars October 9, 2019 Kristin Lam, USA TODAY Comments Off on Donald Trump, California Gov. Gavin Newsom fight again on Twitter, this time over gas prices and electric cars The average price for a gallon of gas in California was $4.18 per gallon Tuesday, according to AAA, compared to the national average of $2.64.