<p>WASHINGTON -- The U.S. Senate approved legislation Thursday that will double the volume of corn-based ethanol added to gasoline after rejecting concerns in California that the mandate could add a dime to the per-gallon pump price.</p>
<p>The 67-29 vote came after a week of debate in which Sen. Dianne Feinstein, D-Calif., fought unsuccessfully for a provision allowing states such as California to bar ethanol additives if they can meet federal clean air standards without it.</p>