celebrate. whether you drive a gas guzzler or not it's a good bet you're paying extra attention to prices at the pump if you plan on hitting the road this fourth of july. >> never really know what's going to happen, goes up and down all the time. >> reporter: good news, right now they're going down. the national average for a gallon of gas is just below $3.50 a gallon. >> it's often a myth that gas prices rise heading into a major holiday. turns out that's really not the case. this year gas prices have dropped for 20 days in a row. >> reporter: the reason? gas supply is up while consumer demand is down. >> one the economy is weak, two, people are driving more fuel-efficient cars and three people aren't driving as much as they used to. >> reporter: aaa says this year's prices are the third highest on record for independence day, right behind $3.57 a gallon in 2011 and a long way from the sticker shock we experienced in 2008, gas