Gas prices are leveling out.Scott Olson/GettyTrump has criticized Harris and Biden over gas prices.But gas prices are falling, challenging his narrative.Prices are now averaging around $3.30 a gallon nationally, AAA reported.Former President Donald Trump has been using gas prices to attack Vice President Kamala Harris.In a recent email blast, Trump said fuel prices had "soared, making commuting and travel more expensive." At a rally in Iowa in December, Trump claimed gas prices had soared up to $8 a gallon, which fact-checkers quickly dismissed as false.The cost of gas has long been a key issue for voters, who — despite global events like war or political instability in oil-rich countries abroad — typically blame high prices on whoever is in the White House.