leases they haven't used in years. >> reporter: the national average now $4.23, the price of a gallon of gas up $1.36 from a year ago, and up more than 60 cents in just the last month since russia invaded ukraine. >> we have seen some measure of relief in the last couple of weeks. oil prices have backed off of the high. as a result of the spr announcement today, the downturn could accelerate and the national average could fall back under $4 a gallon, as long as nothing changes over the next three weeks. >> reporter: in california, where gas is now $5.90 a gallon, the most expensive in the nation, relief can't come soon enough. >> this is insane. what do they think we are, all rockefellers? >> reporter: sergio says it's getting difficult to fill up his company's trucks. >> you look at $600 to fill up that truck. it's all going up and up. when is it going to stop? >> and that's exactly what people want to know. let's bring in rebecca jarvis. and rebecca, give us a sense how long it could take for americans to feel some relief at the pump,