The national average price of gasoline dropped below $3 a gallon over the weekend, sinking to their lowest level since 2021. The median U.S. gas price is now $2.83 per gallon, with the national average 6.9 cents cheaper from a month ago and 5.4 cents per gallon lower than a year ago. However, prices vary widely by state, with drivers in Oklahoma paying $2.409 per gallon compared to $4.560 in California. According to GasBuddy, a handful of gas stations are offering gas under $2 per gallon. That said, diesel prices have seen an even steeper…