Camarillo, Calif. ? Retail gas prices across the country jumped another 3 cents, following a 9-cent hike reported earlier this month, according to a survey released Sunday in Camarillo.

The weighted average price for all three grades climbed to $2.36 a gallon by Friday, said Trilby Lundberg, who publishes the semimonthly Lundberg Survey of 7,000 gas stations around the country.

Self-serve regular averaged $2.33 a gallon nationwide. Mid-grade cost $2.43 a gallon while the price for premium was $2.53.

Prices at the pump have increased nearly 20 cents since Dec. 2, 2005, Lundberg said. Gas prices are 45 cents higher than they were last year, she added. Last week, crude futures climbed again on international tensions about Iran’s nuclear plans and violence aimed at foreign oil producers in Nigeria.