https://www.siliconvalley.com/2022/06/14/why-gas-prices-always-end-in-9-10-of-a-cent/ > As gas prices continue to rise, drivers are angrily glaring up at pump price boards each time they fill up their tanks. > The average national price Tuesday was a little under $5.02 per gallon, according to AAA. Prices are even higher in some states. California had the nation’s highest average price of $6.44 a gallon.