LEMONT – Envisioning cars that can go "coast to coast without using a drop of oil," President Barack Obama on Friday urged Congress to authorize spending $2 billion over the next decade to expand research into electric cars and biofuels to wean automobiles off gasoline.

Obama, expanding on an initiative he addressed in his State of the Union speech last month, said the United States must shift its cars and trucks entirely off oil to avoid perpetual fluctuations in gas prices. Citing policies that already require automakers to increase gas mileage, he said he expects that by the middle of the next decade, Americans will only have to fill up their cars half as often.

"We've set some achievable but ambitious goals," Obama said, speaking at Argonne National Laboratory outside Chicago.