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Story summary
- California drivers face rising gas prices as refineries switch to summer-blend fuel.
- As of February 19, California regular gas averaged $4.59 per gallon, vs $2.93 nationally.
- Seasonal refinery maintenance and Iran-related tensions contribute to the price increases.
- Experts predict prices may rise through spring, peaking around April and May.
- Shutdowns of key California refineries tighten supply across the West Coast.
