The national average price of gasoline has continued on a downward trend after dropping below $3 a gallon a week ago, sinking to their lowest level since 2021. The median U.S. gas price is now $2.79 per gallon, with the national average 4 cents lower from a week ago. However, prices vary widely by state, with motorists in Oklahoma paying $2.366 per gallon compared to $4.469 in California. Diesel prices have seen an even steeper decline, with the national average price of diesel currently standing at $3.671 per gallon, 5.1 cents lower than a week…