As gas tax revenue declines, proposals would raise or create new fees for hybrids and electric vehicles.Frustrated with falling gas tax revenue, lawmakers in Iowa and Minnesota are looking to drivers of plug-in hybrid and electric vehicles to help fill budget gaps.In Minnesota, a bill by Republican state Sen. Jeff Howe would raise the state’s $75 annual charge on hybrids and electric vehicles to $125 and $250, respectively, but is unlikely to make it out of a solidly Democratic House.In Iowa, though, legislation to create $65 and $130 annual fees on hybrids and electric vehicles has already passed out of House and Senate committees. The bills came in response to a state transportation report that estimated Iowa lost at least $317,000 in gas tax revenue last year due to hybrid and electric vehicles.